Yeah, I've seen the movie and it's still not funny... Anyhow, work on your execution. The Kick Ass text doesn't work with the vector/silhouette style of the rest of the piece, and there is no lighting what-so-ever. Also, the object of phallation is... not the best drawing.
There was no lighting in the original batman picture either. I didn't try my hardest to perfect a giant *****.
Work on depth and continuity. Like said before, there's no kind of direction with colour or style. Stick to a defined colour pallete, and either make it all vectors or none at all. The light should be cloudy, the backgorund sky could easily be so much better. And those testicles are humongous.
Choose a way better stock. I suggest to do it all by scratch, you're not gonna go far with that stock.