I would run the burn tool along the BG before adding a BWgrad/lumin. Other than the depth, it looks good man.
I think its nice did you topaz the gun, or was it it like that in the stock? to me it looks kinda like the gun is over-topazed in comparrison to everything else, not a bad point, I like the tag just wondering really..
i did topaz but actually erased the gun and his face the render looked topaz'd. as for depth i thought I did pretty good D;