The ? looks a bit out of place and the green stuff looks good, but it looks a bit lonely. Perhaps it would be better with adding a bit in the other edges as well.
The circles/bubbles remind me of something Paul Weller would use in his artwork....a bit moddish.
Then again, the graffiti styling in your signature suggests you're a hip-hop type?
Nicely done pic though.
Hope you find your place in it all, mate!
Agree with the others.........the graphics look good and talks about your style.
But the question marks looks a bit 'rigid'. While the other graphics have a flow, the q mark lacks motion.
You could use a stream of randomly placed q marks orginating from the head (with some gradual color change between the 2 colors u have used in the graphics).