I like the first one and the third one, great expressions on her face and especially the third one is something a little different, I like the composition and the feeling of the moment. I think it might be more the focus, in the second one the blue background looks like it might be more in focus than she is, maybe it would just take some practice. I learned with manual mechanical cameras but don't even remember how I learned to focus manually except I do sometimes focus just past where it starts to go out of focus again then go back to where it looks sharpest. If I'm having trouble I sometimes take a quick break, just put the camera down momentarily then focus again.