All people are beautiful, no matter of their shape and form. But when the shape is according to a standard which is changing with time by the way it attracts more attention. I personally like physical appearance to have some meat on the bones, preferably bigger part of that meat is muscle. Muscle plays with light and creates nice shadows.There is also more symmetry and order in this structure that is why many people are also considering it to be an example of pretty.
Sony A7R II Sony 55mm f1.8 Zeiss Sonnar T* @f/13 1/200 iso 100 + deep octa