The first one was a bit snapshot-y for me. The concept of stopping the water droplets is interesting though, but could have been executed better.
The second one was interesting with the lines and shapes. Maybe crop a little off the left side, that spot is distracting.
The girl in the alley has potential, but shooting down at her level more would have improved it. I agree too that you should have a much shallower depth of field to bring attention to the subject.
The third looked a little out of focus, but I like the composition.
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