How to draw a colored S-shaped curve with PS? Just like the curve of the ass in the picture. Please tell me the specific tools and steps, the more detailed the better, and give high marks!

Create a new layer on the original image, and the pen points out a straight line between the starting point and the ending point of the hip preset line segment. Click on the middle of the line segment or the part you think is suitable for adding an anchor point, hold down the Ctrl key and drag the point to form a curve (and so on, to reach the required curve segment). Click the brush, select "Shape Dynamic" in the drop-down list of "Switch Brush Palette" (the front of the property bar workspace is similar to the document graphic button), and select "Pen Pressure" in the minimum diameter column. Set the brush diameter between 3 and 5. Select the pen tool again, point the mouse to the curve path drawn in front, right-click the stroke path, select "Brush" in the pop-up dialog box and check "Simulate pressure". Layer-layer style-shines outside. Under the noise column, change the default color to pink and increase the opacity to 100%. Drag the Expand slider until it reaches the desired level and merge layers.