I like this. The folds and hills in the face, especially in the cheeks and forehead, are amazing--like cream.
I kinda dislike the hair at the moment; I fiddled here and there on it, and I couldn't seem to corner the issue...it's probably nothing.
On the cheeks, well sorta below them, by the mouth, he's got stripes I'd definitely look into.
Also, the outline along the chin and to the ears doesn't really fit the rest of the piece.
And besides some minor missed spots on AA (the hair to the background notably), this is a great piece. Good job, and keep pixelling!