For what it's worth, here is my .03 cents worth of thoughts on the images.
#1 - It's shot horizontally (or at least cropped to look that way). I don't like that in this particular picture. It can work but in this image her head is just about dead center and leaves no tension in the image. As far as her facial expression, it looks forced to me.
#2 - This one shows that she does have a pretty smile but the background is just way too busy and distracting. If you would have moved three feet to your left and got the trees behind her for this shot, it would have been much more pleasing I think. Again, this one is shot horizontally and she is dead center. That's pretty much a no-no unless you are purposely shooting that way for some effect, in which case it takes a good eye and some creativity to pull off. That's not to say you don't have a good eye and creativity but this shot isn't a reflection of that.
#3 - This one is showing improvement but the background is still distracting. That yellow thing (appears to be a trash can) keeps pulling my eyes back to it and the approaching car is distracting too. She is covering half of her face with her arm and the sunglasses are covering the rest of her face and so it's hard for me to interpret the intent of the photo or her mood for the shot. Again, moving three feet to your left and getting the pine tree behind her and the car would have possibly removed a lot of the distractions.
I think overall, the key would be to crop tighter in the viewfinder or in the editing. She's an attractive lady with a pretty smile and I think you two could get some nice shots together. Just watch the background distractions. Too much information in the picture leaves people wondering what the subject is.
Thanks for sharing. I hope you don't hate me after that critique. We all just want to help each other get better and that won't happen if we placate people by telling them how wonderful their work is all the time. Post some more! I'd like to see you produce some great work with this lovely lady.