http://img.photobucket.com/albums/v2...U/c4dlight.png
http://img.photobucket.com/albums/v2...stractthuh.png
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The first one is pretty nice the lighting is cool, they both need better depth and the second ones colours need work.
No real consistency in either tags. The color scheme are a bit dull. I think the 2nd one has a nice texture going but it needs a lighter tone. Work on the color scheme on that one. As for the 1st, try working a appealing compo. It lacks right now. Keep at it!
First tag: I really think it looks like one c4d on a black/white background
2nd: I don't like the inverted look :<
kiu