This one is really cool!. I like the coulour mixing, it fits good. Maybe it would look a little better if he did not have the signs/letters over him. Great done.
Yeah, LOTS of colors...a bit too much even >_< It's pretty nifty though! But I don't like the signs over 2D either. The sig is a bit too packed up.
Too messsssssy. Waaay too messy. lol I'd suggest burn/blur for this piece. You blended everything very well here. Colors are excellent. Just work on some depth and it's pretty much good, imo.