How to draw wrinkles in still life colors? How to draw the thickness? How to draw texture? How to judge the relationship between cold and warm? How to draw a three-dimensional sense

Mainly focusing on painting and color expression,

Color still life painting techniques can be roughly divided into three categories: dry painting, wet painting and combination of dry and wet painting. 1. Dry coating step: characterized in that after the first coloring is dried, the second coloring is applied, and if necessary, the third and fourth coloring are added after drying. This method requires neat and neat pen, clear fusion and clear strokes between colors, and is suitable for representing block objects with clear structure and clear turning points. The outline of the drawn object has no clear boundary and will have some implied meanings. If this method is used to deal with the background in still life sketch, it will produce good results. 2. Wet painting steps: The wet painting method of gouache is basically the same as watercolor painting, and it is divided into two expression methods. One is to apply clear water on the drawing paper first, and then directly color it when the water is completely dry. This will let the color naturally penetrate and form rich color changes. Due to the influence of moisture, 3. Steps of combining dry and wet painting: In the process of still life painting, pure painting or pure wet painting techniques are rarely used. The combination of dry and wet painting has more opportunities to be used in sketch. Using this dry-wet combination technique, dry painting looks like oil painting, and wet painting looks like watercolor painting, which brings vibrant artistic charm to the picture.

These three methods can be combined flexibly, and all the effects you want can be shown.

As for judging the relationship between cold and warm, it depends on whether the overall tone of the picture tends to be cold or warm.

First, the physical principles and basic common sense of color. If there is no difference in hue, there will be no difference in shape, size, position, direction, texture and density. The world is rich and colorful. If it is unified, there is no point in keeping the same. The color we see is the color that appears when light shines on an object. Color is not only the important content of our world, but also the language element of picture modeling. Only by using some color classification system standards to make statements can we express them more accurately. People's general description of color differences will produce certain fuzziness. All colors can be classified according to the following three criteria. (1) Different colors determined by wavelength are called hue, which can also be called color separation. A beam of white light passes through the prism. Due to the change of medium, colored light with different wavelengths in white light propagates at different speeds and refracts to produce continuous spectra of different colors, such as red, orange, yellow, green, cyan, blue and purple. "Among them, any color in the short wavelength range that the human eye can distinguish is called spectral color." These colors are the purest shades that the human eye can see. Each color category is very rich: yellow, warm yellow, cold yellow, and hue is the visual response of different wavelengths in physics. The classification of color relative to color is often simplified or complicated. For example, in all color theories, primary colors are divided into red, yellow and blue. Followed by orange, green and purple, that is, the mixture of the above three colors; The third stage is orange, blue and purple, and the first stage and the second stage are mixed. By mixing the first two different color ratios, we can get a relatively accurate definition of the third color. For example, orange is a combination of 60% yellow and 40% orange, or a combination of 80% yellow and 20% red. (2) Color value The lightness index of a color is called color value, also called color lightness and color lightness. The same color has different brightness levels, which is a physical phenomenon of light intensity and is related to light intensity. Color value is the proportional relationship between light and shade in the picture. It comes from the contrast between black and white. Theoretically, the types of this contrast are close to infinity in number. For convenience, we can divide it into: high light, low light, neutral, extremely dark, dark and low dark. The picture created mainly by darkness will be low-key, and the picture created mainly by high brightness will be high-key. (3) Color purity Color purity, also known as saturation, is a quantitative index to divide color presentation according to the number of hue components. For example, we divide the same chromaticity into one quarter, one half, three quarters saturation and complete saturation. On the contrary, compared with complete saturation, saturation is considered as the result of neutralization with other colors, so it can also be divided into half, three-quarters neutralization or neutralization in the same proportion. Color purity is the purity index and brightness of an object color. The more black, white and gray in a color, the lower the saturation, the less bright the color, and the brighter the color. Using these three characteristics of color, we can describe color with reasonable and accurate standards. (4) Color temperature Color is closely related to light. Any particular hue is composed of a certain degree of wavelength or reflected light. Wavelength is measured by an exposure meter, which determines the intensity of light, and color temperature is an index to measure the color value of light source: blue light has a high color temperature, while red and yellow light has a low color temperature. Color temperature value: When the actual light source component is consistent with the spectral component of a complete radiator (a black body that neither reflects nor transmits but can completely absorb the radiation falling on it) at a certain temperature, the spectral component of the actual light source is expressed by the temperature of the complete radiator, and the symbol indicating the color temperature is K, which is very important for color photography. The color balance of color film is based on a certain color temperature. The balanced color temperature of the sunlight film is 5400K, and that of the lighting film is 3200 K. When the color temperature of the light source is consistent with that of the color film, the subject returns to normal. When the color temperature of the lighting source is higher than the color temperature of the color film, the hue is blue, and when it is lower than the color temperature of the color film, the hue is red. Second, the emotional color of the human eye. It can be regarded as a special exposure meter, which is not as accurate as the camera's exposure meter, and there is no unified benchmark for seeing objects, because we are only a rough judgment when distinguishing things, that is, we can distinguish different colors and understand different color languages. Film and television creation uses people's emotional reactions to different colors to choose the main colors and key colors that meet the needs of the plot, the atmosphere of the scene and the emotions of the characters. Warm color series red, orange, yellow, yellow, green and cool color series light green, blue, blue and purple There are similarities in human color languages, which are produced by the same law of human visual physiology. Cold and warm colors are determined by wavelength. Warm colors with long wavelength have a strong impact on people's retina, which makes people swell and excited, while cool colors with short wavelength, on the other hand, make the retina shrink and make people depressed, so cold and warm colors are established. Third, the special principle of color (1) Color contrast refers to the difference of colors. The farther the distance on the color circle, the greater the color contrast. Complementary colors have the greatest color contrast. (2) Color contrast Color contrast is divided into simultaneous color contrast and sequential color contrast. The simultaneous contrast of colors is the visual contrast relationship when human eyes receive more than two colors at the same time and space. The human eye's perception of color will change, which is the color optical illusion caused by the influence of color.

The most important thing is to draw more pictures.