They are all very good from a technical standpoint, but I can't help but think of Zoolander-she has nearly the same expression in all of them. To me, that indicates that you maybe needed to build a little more of a connection with her, have a conversation, get her laughing.
Taking a second look, she also has her head at exactly the same 3/4 angle to her body in all of them, so work a bit on doing some over the shoulder, straight on, and working with the angle of her face more.