Yes, a reflector or fill flash would have helped. That aside, her pose seems very awkward. She looks like she is on starting blocks getting ready to run off the left side of the picture. The awkwardness is exacerbated by the glamour pose of her upper body that has her hand in her hair. Maybe by cropping just below her left hand you can elimate the strange pose and have a pretty good upper body shot.
The bushes in the back are nice, but I don't think they add much to the image. Perhaps these could have been blurred with a wider aperture. If she were wearing an expensive dress, my advice would be to keep the foliage and go for a rich girl in the garden look. However, with the jeans its hard to pull that off.
To summarize, pose, reflector or flash, and depth of field can be improved. Hope that helps.
