I think it should be mandatory.
But a picture doesn't mean everything, you could have a fit ass guy who is genetically blessed and works hard but really doesn't know ****.
Then have completely out of shape bastard that has a studied really deep into the material (degrees,certs, ect), but just doesn't feel like making the change to him/her self.
We lift weights and manipulate our diets so that we'll look good naked. Sure, it's healthy too, and we'll probably live a longer and more productive life than the average guy, but mostly it's about the naked thing.