What is a photo? Is it taking pictures or exposing without clothes?

Not naked, of course. Nude art is called nude art, portrait. In Chinese, the original meaning is to draw portraits of characters, which is the traditional name of figure painting in China. Painting a portrait requires simplicity, so it is called a portrait. Nowadays, art photography is commonly known as art photo album. "Portrait" in China's ancient painting theory refers to "writing the truth of things", that is to say, when painting, it is necessary to show the true face of objects, and both landscape painting and figure painting should reach the "true" painting realm.