Try to variate your use of brushes...It's pretty lucid when you glance at it that several of the splatters are identical.
dont lower the opacity of the brushes especially on a white BG.and erase the parts of the brushes that are over the render so it looks better.its good,but i suggest you go download more brushes at www.deviantart.com
Red splatter behind his back, its cut off. You can see the top is flat because of where the brush border is.
google stalemateisgod....i use these brushes all the time. And you can find a whole lot more on filefront. And the opacity and blending should be played with, very plain.