Why is there such a big difference between standing and sitting when taking standard photos? It seems that the faces in both cases have changed.

When an experienced photographer takes standard photos of others, it doesn't make much difference whether the subject is standing or sitting.

Ordinary photographers may take different photos for two reasons:

1. When the subject is standing or sitting at different heights, for example, the camera lens is not on the same horizontal line with the center of the subject's face, and the subject's eyes are looking at the camera, the photos taken will have a slight feeling of looking up or down, not only the face is different, but also the eyes are different.

Second, even if the camera lens and the face center of the subject are adjusted on the same horizontal line, the posture of the subject standing or sitting will be different. Generally, when the subject is sitting, if the photographer does not make adjustments, the subject will stand out or lean back (backward). When the subject stands, his back is relatively straight. The photos taken by the two people must be different.