I really like the 3rd one, not sure if you still like getting CnC, but as Daisho said that smudge in the large art is a tad annoying, if you still have the PSD or XCF or whatever Gimp's equivalent is then it should be no bother to remove.
For the Third I think the face should be more defined, it took me a few seconds to figure out what the render was, nice colours and effects though.
The second is so very oversharpened in places, if you got the right balance it would have looked much better. As for the first I haven't much to say about it.