I'm still learning portraits so please don't take my comment to critical but I would've cropped in on her and less of the bush in the background. Maybe had her tilt her chin towards the camera just a tad as well. Color, clarity and lighting are phenomenal though!
David - Though posed, the photo has a very natural feel to it. Her clothing and the background help create to this tone. Her relaxed look shows a comfort with her setting. Beautiful lighting, with a nice balance of color, in a crisp photo. Well done. Thad