My goodness, my eyes, they burn...BURRRN...
no, seriously, all of these colors are so oversaturated that I (and most people) can't stand looking at it... try desaturating the green hair and the yellow skulls and eyes, then we can talk... other than that, what is this? It looks like an LSD trip o.O
... if you elaborate the illustration this could become somethin' like a reggae album cover? maybe... work on your illustrations and you'll become better