#1 - The flowers are beautiful (maybe a little too much saturation), but distract my eye from the girl. Her expression also leaves a little to be desired.
#2 - Nice shot, but as mentioned earlier, cropped a little too tight for my liking.
#3 - Nice shot, but the backlighting is very distracting. A reflector might help you in these instances, or try turning the subject so you get good lighting on her face and body.
#4 - I think this is my favorite of the group, even though is has a few small issues. First, my eye was drawn to the blown out area in the background. Her arm is almost blown out too. Try reducing highlight levels in PP. Also, the crease under her right front pocket is distracting to my eyes.
Overall, these are quite nicely done and with a few minor tweaks could be even better.