Great pose, great smile.
A few things - in portraits, shade is our friend. It gives the best even lighting. Then, you can work use reflectors, flash (if you want), etc to shape shadows and such for non-flat lighting. It looks like you had some shade toward the bottom of her torso, so, maybe having her take a few steps forward would have helped?
Second, shoulders square to the camera tends to look more aggressive than if you were to have her move, say her right foot about 4-5 inches back. That would put her shoulders at an angle, and make the frame a bit more comfortable. Although in this case, she does such a good job connecting with the camera (and the viewer) that it's hardly noticeable.
d8
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