Well his face hasn't changed. But the hair can make a lot of difference to some people. Blonde is more his colour, and the shortness of it makes him look less emaciated, if that makes sense. It's like, if he has a great deal of dark hair, the rest of his face seems smaller and less healthy, also he seems much paler, in what looks like a sickly sort of way to me.
Not that the difference is very great, but it is there.