Too small to see much detail. Try a different method of JPG compression (Photoshop-->Save For Web is awesome!) to get bigger, while staying under the file size limit.
Hibiscus is an interesting choice for this challenge, because of how far outside of the flower the sexual parts are. I'm sure others have already commented that it should be larger.
This is too small to really make an impression. There isn't any brilliance to the pink petals. The background should have been blurred using shorter DOF. It doesn't say anything to me about proportion.
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