#2 is my favorite overall, I really like the pose and composition. I wish your model looked a little more comfortable though.
I think in #1 they get kind of lost in the scenery and #3 I don't like the framing, too tight.
#4 is a little blown out which is distracting but your model has the best facial expression here.
Overall very sharp, nice colours and nice DOF on 2 & 3.