Try to choose between cleanliness or grungy. It looks as if you have grunge and clean stocks in it. For this one, I think it'd look better clean though. So lose that crack stock IMO. I don't mind the text here actually though.
Keep truckin bro, you're going to break through soon, I'm feelin it.
pretty much everything gety pointed out as well as making the colours flow. i don't like how the sig is a pale red colour while the lighting is yellow. keep at it man. you can see that the potential is there, you just need to execute a little better.