I think the first shot is the strongest of the three. If you draw a line from the top of her head to right between her legs, that line is very vertical and very centered in the frame. But because of the tilt to her hips and the slight twist to her torso (one shoulder is slightly more back than the other), this pose works, it's not a boring straight-on-to-the-camera shot at all. A very nice shot!
I actually do like the monochrome conversion in shot 2, and I like the 3/4 angle of her pose. Where I think this could be improved a bit is in the cropping. I'd like to see some more dead space to the left of the frame, and maybe to the top. She appears to be looking up at something, let's give her some space to be staring into. As it is, her head is very centered (her left eye is pretty much on the center line, and there is very close to the same amount of dead space to the left and the right of her head). Even if you don't want to add much dead space to the left, I think you could get away with centering her face (put the bridge of her nose on the center line). I'm also not really feeling where the right and bottom edges fall (just after her shoulder and just at the bottom of her bust). I think (though I'm not certain) this shot may benefit from moving those edges either in or out.
I'm not loving shot 3 (especially compared to the other two). From a technical aspect I think it's solid, though I might have tried to even out the light from the left so it got her legs and her arm more. This pose is about the full body position, so IMO there shouldn't be fall off on those areas. (In contrast, in shot 1 you get fall off on her legs as well, but I see that shot as more about her face and the quirky shirt.) I'm not the biggest fan of the pose, but that's just my opinion and irrelevant to what you two were going for. I will say, however, that this pose does put the side of her arm square to the camera and makes it look relatively bigger (I hate to say "fleshier"...) than I expect it looks in reality.
Solid set, thanks for sharing!
