You should really use the Save for Web feature to get your images ready for challenges. It will let you set the file size and image size to the max levels. Here is a tutorial that will help you out. I think making this full size would have put you at least in the top 5. Looking forward to some full sized entries from you. :)
More a image of lighting than a creative use of lighting. It's hard to rate this because of it's nature. It might have been a better approach to find a subject and then use the lighting to create the image rather than of the light itself.
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