Really like the light on the grass (is it grass/hay?) at the front of the shot, and the haze behind the model. It gives the image that warm late 60s or early 70s feel. I don't know if it was intentional of you or not, but the framing contrast between the haze on the right and the tree on the left, works really well in my opinion. I really like it
I also like the pose, but something is bugging me about it that I can't quite put my finger on. I think maybe it's the hair, as that doesn't seem to fit the relaxed style of the photo, as is the same for the makeup. It seems too controlled. Personally I like to see minimal makeup in this sort of photo, but that's just my taste.
Very nice photo, that I'm adding to my favourites, non the less!
I'm finding that it's the camera angle that's bothering me- the low angle shot makes her look very dominant, and the title "Thinking too Much About You" gives the impression that she should be looking vulnerable, in which case a high angle shot (I.e, the camera looking down at her from above) or a level shot (straight at her) may be more accurate and effective- that may be what's giving you the bugging feeling But I totally agree, it's a lovely photo Well done!