It's interesting that you put them in the same thread. They make sense being together.
May be it's the lens, but there is little variation in depth of field. Everything in these photos are in focus. I think they can be stronger if there is more subtle emphasize on the subjects.
The second and third photos are really, really good. The first photo is less succesful in my opinion because of the weird framing (her head is right in the center), and really requires a shallower depth of field to isolate her from the background.