The color image seems a little bit soft, I think some sharpening could fix that. Watch the highlights on her arms, they are a little bit blown out. It looks like you used the recovery slider a little too much, because some of the highlights on her face are an unnatural gray.
I agree with everyone else, the B/W version is definitely the strongest, and I think that has a lot to do with the lighting. It looks to me like you had two softboxes at around 45 degrees from the camera, on both sides of you. She turned sideways for the first one, so her face is well lit, and there's a nice rim light coming from behind, which gives her some definition.
You have to be careful around the eyes when you light an image like you did the second one, the shadows fall right in the inner corner of each eye, and it's not terribly flattering. If you applied the same lighting to the second one as you did in the first, it would help a lot, and this would mean moving the lights between shots.