http://xkcd.nl/e60/3b6e666e534f
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Is it me, or do I really want that render in the middle? You could also improve lighting, and there is a blurry thing on his stomach.. Kind slightly distracts.
I also agree that it should be in the middle. There isn't much going on around the left side, and all the focus is on the right. Would look better if you did a smaller image with that render. But yea.
You should also improve the lighting, add a light source, Like Ezzis said above.
You need to work on smudge composition, doesn't quite fit
ver2 i have change as per u..a try..may not be perfect..
http://xkcd.nl/eFh/9fb1e847eefa
I would put him more to the left of the tag because of the way he's standing