Don't like the colour, use colour balance instead. If you did, you moved the sliders too far. The text is ok, for a jokey type feel. And the render is alright, the dude on the left had a double barreled smg!!! Needs a black borded. Just 1px or so. Yeh.. bit too much contrast on the background, tis a background not a foreground.

Try multicolouring it with soft colours. If ye don't know how pm me, or look for tuts =)