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I really like the last one, but it needs a little help. You are shooting in open shade and there's lots of foliage around, which is causing a green cast to the skin. It needs a little white balance work.
How are you editing these? I like the light, pastel look, but the hot hand, dress and book detracts from the face. I think they should be toned down a little.
Here's some suggestions for the next shoot. Have her pull her right arm away from her body slightly. Holding a bare arm next to the body flattens it out and makes it look larger than it actually is. Your Sony did a good job, but 30mm on a crop body like that is still a little short for portrait work this close. Notice the relative size of her hand compared to her face. When you have the hand so much closer to the camera than the face, it is going to distort the size. A longer lens will minimize the effect. Even on a crop body, I'd use a lens of 85mm, 100mm or even longer to prevent this.
Thanks for posting and I look forward to seeing more!