I like the 1st and 3rd shot but I don't find anything caught my eye in the 2nd shot...
Maybe a bit of fill in flash for the 1-3 shot to eliminate some the harsh sun shadows...
i like #3 but i think it would have more of an impact if 1. she had different clothes on, and 2. she was facing the camera more with a different, more dramatic expression on her face. The shirt is distracting to me, i think a more plain shirt would work better.