Depending on what the guy is doing, well from my perspective he seems enraged, so maybe make the background fitting with his emotions? I may be wrong about it, just some input.
It doesn't matter if its plain or not. As long as most of it is filled its ok.
Overcrowded sigs (like yours) aren't good all the time. Theres no point in crowding it with a bunch of c4ds for unnecessary reasons. and its a Vector sig, so ya.
