C&C per req:
1. I'm afraid I don't 'get' this pose. It looks to me for all the world like she has just burped or something. It's also significantly over-exposed and seems to have a strong yellow cast. I would take this back to the pixel room and try and adjust the levels/curves to bring the exposure down a notch and maybe tweak the WB as well. I can't say for sure, but the eyes look a little soft to me.
2. In this image there is now a strong red cast, which, judging from your backdrop I suspect may be caused by the incandescent lighting "fighting" with your speedlight. Pose and expression are fine here, but without any catchlights her eyes seem rather dead. Understanding the limits of your lighting, it would have been really good to have either a toplight or hairlight to put some detail into her hair.
3. This one has potential, but I really don't care for her expression. I would also prefer that she be looking toward the camera; not necessarily right down the lens, but at least toward it, since as the viewer, we can't see what she is looking at.
Overall, they're a good start. The biggest improvement you could make (aside from lighting) would be greater separation between subject and background. place her at least 8 - 10' in front of the backdrop and use a large aperture to isolate her in the image.
Keep practicing; just my $00.02 worth - your mileage may vary.
~John