http://i44.tinypic.com/ei8i03.png
Printable View
i like the colours and depth, text is lacking in quality and size me thinks. You could have positioned the c4d so it was in parrellel with the arm or something similar to give it a purpose. White bar doesn't really achieve much.
Why is there a blob of white on the right side?
It looks like you have two light sources
The text could use some work
Everything else looks pretty cool though.