I dig the more complicated pose you chose for the woman in the back; frankly, I almost want to see her by herself. It isn't that the other figure's pose is less interesting, but more that she leads your eye out of the composition. Which isn't helped by the curvilinear lines in the background; lead your eye out of the picture just as much, if not more than, the front woman.
The women themselves are, for the most part, really well rendered. My complaint is with each of the women's hair. Honestly, their hair is the first thing I noticed; the saturated colors you used in the hair contrast greatly with everything else in the picture. By itself, that isn't a bad thing; it's a great way to create focal points. Unfortunately their hair isn't as well rendered as the rest of their bodies, which breaks the realism found in the rest of each figure.
That isn't to say that I don't like the picture; I just kept getting pulled out of the picture or too distracted to appreciate how well rendered each of the figures are.