The render seems common these days so we could up the ante and start drawing him in a different ways. but this ones okay. Good job!
Get a better render...you can see the white specks around him. Make the sig smaller too, it's too big in height.
I'm not really digging the checkerboard thing going on on the right and get a better render because the white outline makes it look crappy. Also get rid of the text and resize the sig so it isn't so big.