I like the colours here, but I think the way the flower is lit has really taken away from it. It seems flat, and we are losing a lot of the texture and mystery of the flower with such direct, flash-like light. The colours are washed out some as well. I think your composition is great though and I like this unique angle!
Nice detail and interesting viewpoint. My criticisms are shallow DOF (soft in the foreground_ and the lighting which causes the front petals to shadow those behind.
Lovely colors, good submission. The only thing I could really comment on is that I would have prefered to see the whole flower sharp, the green at the front is burry. A higher aperture number would have taken care of this.
If you wanted to truly fill the frame with it, there's some extra space on all sides that could be cropped off. Sorry. A lovely shot, but not suited to this particular topic (as cropped). When you can see background about 70% of the way around the subject, it by definition hasn't filled the frame.