She's cute. I would try for a plainer background -- look all around the frame before you take the shot. Is there "stuff" in the background that is distracting? In this case you've got someone's legs, plus a bit of clutter behind. I would move her to an area where you could get just grass, or bushes, for a more uniform background. Then, place her a little way away from any bushes/trees rather than right against them, & use a wide aperture to throw the background out of focus, & you'd get a nice mottled green. I might also be inclined to back up just a little myself, with a bit longer lens. Wide angle shots close up can distort faces. You have a wee bit of that happening here -- although, that might be the effect you're going for! Also her face seems not quite sharp -- maybe a faster shutter speed if she's not holding still.
You have a cute little model, so keep trying
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