It'd actually be really good if you removed the (from what it looks like to me) that "dirt" effect from the dude, and you tried adding a drop shadow but you didn't use a transparent background so on a darker skin you can see the white. So if you add a transparent background, you got yourself a good sig.

Oh, so theres no other renders without dirt? It looks pretty good though, better without but still pretty good.

Oh, I think I know what the image is from then, yeah then theres no way of removing the "dirt".