This is really not my area... buuut:
Shot 1: I really would have liked to see a tiny bit of flash to just fill her in for this shot. Just so that she is not in total shadow and that we can see a little detail in her eye (inest of it being dark and bleeding into her eyelashes). You exposed the shot well to keep the sky in check which is a good thing, now you need a bit more light on the subject. You could even have used a reflector to just redirect some light.
Shot 2: I see where you are going with this shot, but I feel that it doesn't work because of the background areas. It's a contemplative pose and the framing is one which brings the background areas very much into the viewers attention - thus we need something better for the subject to look out over rather than just grass and a rising fence - the fence is not all that interesting and it rising up out of the landscape rather puts a wall like feeling to the shot. I would have wanted a scene without the fence at least and idealy with a background showing some landscape/aspects further off that would be able to hold a little interest.
Shots 3-7: I see again where you are going with these, darker and trying for some mood, but again I feel that your subject is just in too much shadow for good presentation. Further her face is often one of the darker areas of the shot, rather than a reletive brighter patch which means that our attention is not drawn there first. By the last shot you have started to get a better overall presentation - her face is brighter so we are drawn to pay attention and the background appears slightly better chosen.
Shot 4: The foreground distractions are just too distracting for my taste, they obstruct our view and appear more like a mistake than the delibrate move you were making and the image you are trying to create. Again her face is very shadowed and dark.
I do like the compositions you are experimenting with in these shots, but you need to work on your lighting and pay attention a bit more to your background areas. Some offcamera lighting setups (flash or simple reflectors) would be a great asset for you to look into for this kind of work.
), so I want some C & C on these first shots. 
