You can observe those photos, and you will find that the face in the photos is bigger than usual, fleshy and not very symmetrical. There is a simple reason. Under normal light, the colors of chin, cheeks and cheeks are heavier than those of nose and forehead, and the facial features are naturally distinct and have a strong three-dimensional sense. But the camera will capture subtle light, and the shadows of these faces are obvious, that is, adding the contours of two cheeks to the original face shape will naturally be "big". Or why the stars are desperately losing face in order to be photographed, especially their thin cheeks. It is difficult for people's five senses to be completely symmetrical. Without the cover of contrast between light and shade, they show asymmetry. The shine on people's faces will be reflected in photos, which will show the feeling of thick meat.