For me the render is just a little on the small side, I'd make him a touch bigger and then maybe think about adding a little sharpness to the background. Maybe think about tweaking the colour a little as well and you'll have one nice tag
The whole is about the Background now, enlarge your Render and don't let it fall to much in the BG, also don't give it an to lightened tint. Your render has to come out of the BG with nicer colours.