Research literatures on body image in general, stresses too much the unhealthy aspect of them, such as anorexia, bulimia, body dysmorphic disorders, and so on.
It lacks the basic research on body image. For example, how we represent our bodies from the outside of the body, whereas it is impossible. If we have our own body images in the mind, what is it for? Why is it necessary? How we use it? Before stressing the disfunction of the body image, we need to know the ordinary function of it.
Body image is formed with the gaze which represents the body from the outside. In contrast the function of body schema doesn't include this perspective. Neuroscience research on the body seems to ask only the body representation in the brain and doesn't ask the problem of the perspective, which makes the body representation--the perspective from where the body is represented (from within or from outside).
The body image is based on the the perspective of the other person (the third person's perspective).