Well this is looking really good but here's a paintover with a few nitpicks.
Muscles: You need to work on your anatomy here. This guy is meant to be a man isnt he? give him some bigger arms. Also move them further out from the body to give him a wider, more "bad ass" frame.
Bigger shoes: You're *almost* there in terms of shoe size but don't be afraid to push it a little further. Remember, big tough men need heavy foundations in the form of huge feet.
Hair: Anatomy again here. You forgot the hair. Judging by his shoes he's a very powerful clown so I suggest orange/red for the hair. Think of the most important clown you know - Yep... Ronald Mcdonald. Is he bald? No. He has red hair.
Fingerless Gloves: Without knowing much background on this piece I can only assume he's part of some kind of clown resistance. Nothing says "resistance" like fingerless gloves! Plus they're super cool and an important part of any 3d character.