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I really like 1 and 3; nice lighting and poses.
I find the pose in 2 uninteresting but I disagree with killersnowman that frontal pose isn't flattering with the model. The model is a bit athletic (the definition in her abs/obliques is shown better in 4 because of the shadows) so I'd argue that it works for her.
4 is fun photo, but like #2 I'm not really digging it for some reason. But as noted above, I do like the lighting on this one as she doesn't appear quite as flat.