Tara

Ok, here's a little C&C, always offered at great peril...

First, in the first two shots, I'm seeing just a hint of front focusing, where the collar is the sharpest point.

Second, in the first shot, the brightly exposed area of her camera-facing cheek and neck area draws the eyes away from her face and gaze, which, imo, does not serve the portrait well.

Third, nitpicking, in the first shot, I believe the eyes have been over-sharpened in post processing.

I like the second best. Flattering, natural, an attractive subject complemented by a good background. Is the t-shirt just overexposed?

The third shot, not my taste, and the front of her hair has gone gray.
 
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The positive: subject is very comfortable with you - way to go.
The negative: green cast. Choose your spot well. If wanting to shoot under trees, choose tall ones especially if the plant/tree is not part of the environmental portrait.
 
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