i dig the face a lot but the body is weird. I mean I know its suppose to be weird but there is something kind of 80's metal head ball point pen drawing about the whole thing.
Maybe just taking a more original approach to the whole thing. There are really well rendered versions of this image all over google. Id just do one of those if you are gonna stick to this traditional verison. If you are going to do your own version you may consider coming at it from another angle. Not so straight on, maybe zoom in.
I dunno.... I wish I could be more specific but something about it tells me you can do better. I know you worked hard on it so I wouldnt fault you if you didnt listen to me. haha.