It doesn't blend whatsoever. It looks like a render placed on a background. You blend by using background effects, as well as effects on top of the focal to make it not look so fake. Work on coloring, and effects use more.
nice i really like it, maybe try blurring around the guy a bit its a bit too edgy for me, and he seems dark, but thats from the picture, simple background and everything.... simple but effective =)