O_O
Love your style man. And I really like the texture/fx you used for the background.
*helpful hint my BRUtha! :P: Go for a deeper darker contrast with your shading. You ether put the shading there or you dont. You put shading there but its So light. (btw I had the same problem(scared)) lol but yeah it would ad so much more depth.
But to do that you would need to place the lighting right...so just imagine a light source and how it would hit the character if he were 3D.