I like the first and the third (the most).
The second, imo, just looks faded rather than anything else.
The shortcomings in the first, as I see it, is that she is leaning backwards and there are two things that draw the eye - her face and her hands gathered at the bottom separated by a wide expanse of nothing much interesting.
The third, on the other hand, is beautifully treat and composed, the arms folded and supporting the composition. I only wish it were treated like the first. I also like the direct pleasant gaze more than the faintly supercilious glance of the first.
She is, of course, quite beautiful, but that is beside the point.
It is a pleasure to see such thoughtful work.