Cute girl, great eyes, sexy shoes ...
Of the three, I prefer the second one.
Something about the in-turn of the left foot in the first picture makes it a little awkward looking, to me.
I think what I like about the second one is that it's the least posed looking, in that she's not looking at the camera. I think you could put together a really great set with her if the shots looked a little less deliberate.
Just my opinion ...