i was just looking at this with a colleague and we noticed two things--
first, the original image looks like it was inflated to look bigger itself, which, in theory, would make it easy to go back to that original. who knows. it's a possibility.
also, since we're looking at such a low resolution video, there's no way to tell how good the image holds up when looking at it closely. there are all sorts of goofy artifacts you can get from those tools that may not show up to us at such a low resolution. the hair is something I'd have to see closeup-- that's hard to fake.
This guy:
photoretouching_glrnnferon
is famous for his retouching, but his site looks like it's under construction at the moment. it's fascinating what he does, and it's mostly well-known stars that he retouches for print work.