Probably as much a personal thing than anything else, but I feel that #1 lacks a little balance, and would prefer the right to be cropped to remove some of the black, as the model's top shows little separation from the background and would like to see more room on the left around his head to offer a more pleasing composition. That said, it's nice to see experimentation with something different.
#2, the model looks uncomfortable and the image doesn't get her personality across. Compositionally though, it is possibly the weakest, as the cutting off of her elbow looks awkward.
For me, #3 is by far the strongest image, as it portrays a story and really connects with the model.
In #4, the model looks disinterested. It's always a risk when the model isn't looking at the camera, it can work, but it is harder to get it right.
#5 is a fairly standard pose. Lighting is a little harsh, but handled well. Some engagement with the model, but not quite there. I quite like #6, not sure exactly why, but the cropping works well and the black and white simplifies things down to the model and her interaction with the camera.
There isn't anything particularly wrong with #7, although the lighting isn't the best, but it doesn't do much for me. Again, it's difficult to get an image to work when the model isn't looking at the camera.