I can kind of see where you're going with this, but I think it would be a bit better if the colours somehow blended from one to the other. The anime sticker looks like it's just been stuck on and does look a bit out of place, again I think it needs to be blended in somehow. The Joker theme would go pretty well, as would a Hulk theme given the choice of colours mate. Either way I can see a lot of workmanship has gone into this so keep it up on those counts