The lighting is good but the scan is what is making this image look bad. Good pose with no distracting background, nice props in the foreground.
Are you scanning with a flatbed scanner or film scanner? Don't compress the image as much when saving a jpg. Try to keep your image in the 85-100 range.
Really great idea in capturing the innocence. Perhaps a higher quality photo would have improved the composition of the picture as well as lighting. I have to say though that the cone (2003) detracts from the face, which is what you are trying to focus on. Furthermore, getting a little bit closer to the girl would have captured the eyes as well as posture of hands. The background grass isn't needed to much, so less is okay. Also, it would capture the shoulders and no back. Again this is good to focus on the face and hand posture.
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