Not bad. A few thoughts for possible improvement:
1. It looks like you're shooting exclusively with ambient light. In this case, while the lighting isn't bad at all, it appears that it's causing her to squint a little bit, and there's a rather strong shadow below her nose. The main issues I see are the fact that there's so much bright light behind her, it pulls the viewer's eye away from the model and into the background, and her pose which has her weight on the near foot and puts her into a masculine pose. Generally speaking you want to keep the weight on the back/far foot which will produce a more attractive curve for the camera.
2. I like the lighting/exposure here a lot better, but there's so much of the image which isn't adding anything. I can't pull up any EXIF data at the moment, but this looks like it was shot with a short-ish FL and a smallish aperture. I would have wanted to be at >100mm and somewhere around f2.8 - 4 for this to soften the background and isolate the subject.
3. This is the strongest of the set IMO, the lighting is pleasing and the pose, with weight on the back/far leg seems less tense. The only point of any note is the positioning of her left hand/arm. Since the bottom of her blouse is so high, and the way her arm sits, the little bit of trouser front we looks odd. I think moving her arm so more denim was visible would have made this stronger.