every time I'd seen this photo, I only focused on the subject in the foreground, if I were the one verifying that the person in the photo is real, I'd have fallen for it. To me, the subject is entirely convincing. the issues you mentioned about the clavicles and hair, i think kind of make it a bit more convincing. Nobody is completely symmetrical for one, so seeing something like that, while not common, wouldn't be necessarily uncommon. The hair, to me, just looks like normal person hair. sometimes hair do be like that.