Nix the first version, the second one's much better because of the color unity. In the first one, it's vibrant, but scatterish. Also, the part of her breasts that are submerged should be rippled, seeing as how they are underwater.
Also, it'd be much better in future pieces to improve the way you do hair (such as adding in more ink shading, or more hairs. Right now that texture on the hair disturbs me, artistically speaking. It seems like a cop-out, when you should be doing more with it.
The linework is great! Thumbs up!