The implication of this article is that agencies would be obligated to use what the article calls "more obtainable" bodies. Is this actually the case? I think it's vastly more likely that this will do little more than sharply increase the demand for people that actually have the bodies that other individuals were being photoshopped to have. It'd be like if a country banned all voice processing software when singing (…
You could always insist that the distribution of bodies shown in a magazine follows the distribution of weights/heights in the general population (with some margin of error). And heavily fine them out of business when it does not. Problem solved.
(The voice processing ban example doesn't capture the problem with body photos, because people don't go out of their way to sound like their favorite singers -- auto-tuned or not--, nor does it have many adverse psychological or health effects to have singers voices be unattainable to most people. Whereas body image from ad/fashion/etc models influences the self-perception of billions of people, and leads a multiple-100s billion dollars industry).