That tutorial on banding is very enlightening, and mine definitely has some banding, still not entirely sure how to fix it yet. But i'll give it a shot.
As for the head, your right of course. I thought it was a problem with the face. But it is probably more of a head problem, since I have already tried moving around the face.
I am not sure what to do about the saturation.
Ah, no I thought the sleeve looked a little odd myself. Wasn't sure if I should shrink the near side or expand the far side. But tweaking the far side seems easier.
Edit: Edited to re-add some of the lost contrast.