Not a critique per se but just my quick personal thoughts:

#1: Bad use of wide angle for a portrait. Not enough fill light. A reflector is key in those situations. Dusty neg.
#2: Excellent portrait but the window is really bothering me. It brings me back to your setup instead of keeping my attention on the model.
#3: The best of the bunch by a long shot.
#4: Too amateur on all accounts. The pose, the hidden feet in the sand, the non-existent left arm, the hair hiding her face, the sunglasses, the little shack on the horizon is distracting, the sand itself is distracting with all the Tire trails.