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Your last shot is different and I actually like it. The added room up top adds to the shot too. The others need some improvement, but overall you're on the right track..
1) Kind of an awkward crop with chopped parts.
2) Your subject in front is slightly out of focus, and it really needs a face. Depending on your location constraints and gear, you'll want to hold true to the idea of comping and cropping real tight for maximum impact.
3) Since the feet are chopped, I might crop super tight to her face. Just below the NNY in her uni.
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