http://www.empirepic.com/images/w1jqdl0zr8gjgl22ymd.png
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I think the c4d's look a bit too sharp, other than that its not too bad :)
I like this. Nice use of color with the c4d's.
Yep the c4d's are a bit to sharp, and they dont realy have a centrain flow
Try to get it flow with the render a bit more,
also next time try to place your render not in the middle,
i can see improvements soft :)