One thing. NOT. ENOUGH. EFFECTS. Seriously, it looks like you enhanced the stock a bit before slapping down two affects, text and WAHLA! YOu sire have this sig. Try distorting the original stock a few times with displacement. It makes the image look like you actually did something. You could blur out everything behind Zack, too. Also, put some colour into it! The squiggles and stuff don't even match the stock colour wise.
Moar efec in da bottom fo depth, n' I thnk if chu revrsed der pennin' it lok bettah. Fo real. Add more effect to, I see what you are trying to do but it needs more to make it work better, and reverse the in and out pattern of the pentooling I think it would look better. Plus BG and render don't match to well, its throwing off the color scheme a bit.