This is pretty cool. The dude is almost lost in the background, but since that's the point, it works well. Good composition, the ground at the bottom of the frame is really necessary to give it some weight at the bottom. Good concept, the dynamism of the guy works well with the art in the background.
I like this. I guess if you wanted to separate him from the background a bit but still leave it all busy and colorful you could slightly underexpose the background and light him separately. It would not take much of a difference in the light ratio to do it, since you still want that great back wall.