It's a bit noisy around the outside of the shapes, and I think you could increase contrast by a bit and consolidate some of the colors, but other than that nothing really strikes me as off.
One thing, though. The way the red markings are arranged on his face and chest has my eye confused as to whether his head is craned forward over his chest, or his torso is just turned sideways to face the screen. It's a minor thing, a trick of the eye, but might be worth looking at all the same.
