Why so menacing?
What is the story with Clowns that look like they are ready to rip someone's face off as soon as look at them? This one seems like he's thinking "If that custard pie comes anywhere near my face or trousers, I'm gonna cut you."
Perhaps the face paint could be changed slightly - the moon shape doesn't look very symmetrical and with the way that the rest of the face does, it feels like it should be.
Give the guy some ears and a little hair, like sideburns or something similar. As regards the hat, you need to make it look more 3D, as opposed to a triangle that sits atop his head.
Finally, the postcard size of the piece makes it a little difficult to get around, so I'd suggest that you make it slightly bigger for us all to enjoy.
[Review Request Club]