I'd like to see you try cloth.
Well, I third the statements against the head. Looks like you crowded the "eyes" in and now they're really close together. I think it'd be cooler if the eyes were on opposite sides of the head, like a horse or a fish. Then have a long, slobbery toung loll our of his mouth and drool on his moob for extra disgust.
I really like the background so far reminds me of a subway station.
I also ditto the dislike of the fade to white at the bottom of him. It seems so forced.
Why do his moobs have such brighter hilights than anything on his belly?