First off, always try to include some info about the shot in the Photographer's Comments section. It really helps out when we know what the photographer was thinking and what equipment/lighting/etc. were used, especially when you request a critique.
Camera Work/Technical: Great positioning and excellent point of view. You subject seems nicely focused, while your background tapers nicely off into a blur. You did lose some detail in your darks due to the camera doing all it could not to overexpose the brights.
Lighting: Your choice of lighting is why this photo didn't do better in the challenge. Your lighting is a bit too harsh, and choosing a different time of day would have produced better lighting results.
Composition/Content: Very interesting flower, and it makes a great subject. Your point of view also provides a very interesting composition. Great rule of thirds use that keeps the viewer's eye roaming all through the frame.
My Opinion: I like the idea, but I think that is scored appropriately. You probably would have picked up another half point or so with a lighting change. As is, I would have voted in the 5 range.
Really unusual flowers! Great angle to shoot from. It is a shame that the undersides of the flowers are so heavily contraste out - the colours look as though they may have been interesting.