Needs a background
Hmm, I think that while this is a pretty decent effort at 3D rendering, I think that you really need to add a background, to add context to the piece in question.
That said, some of the features look a little angular and need to be smoothed out - the nose for example seems quite square. I'd take steps to smooth that out. The hat wouldn't be that thin - you need the contours of the underside to compliment the work you've done on the top.
Detail is your nemesis at the moment - your lack of it lets you down. Try to use shading to define the difference between neck and chin, as the skin isn't going to be the same colour across his entire body. I can see a little line put in there to show where the centre of his chin is, but it's that feint, I can't tell all that well. Finally, I think the left eye (as we look at it) is a little far out towards his ear, unlike the right.
[Review Request Club]