Why is she looking away? There must be a story to follow when she is looking away. These are too posed photos with no emotion involved, just frozen eyes.
In #1 there is slightly hint of actual thinking process, the rest of photos are wanting not to blink.
#1 also weird crop
You need to pay attention to the background, to the lines you see. Where is the best spot for a model to stand in relation to the background? What she has above her head?
If you capture emotion none of the rest would be that important. But with that said you need to think about everything that you want to include/exclude in frame.
#4 is your best. Great spot and you nailed the pose showing her curves, but again, what are the head and eyes doing? she is stiff and frozen.
Relax her, it is your job as a photographer to relax the person in front of you. If you get true emotions out of you subject then you did a great job and people wouldn't care if there is something growing from her head in the background...