I will probably get hammered for thinking "outside the box". But this is what came to mind first when I saw this challenge come up. This is my first try at a macro shot.
Edit:
Adjusted bright and contrast a little.
Cropped
Save for Web
Ran through Neat Image (Yay First Time!!!)
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Nice image. However, flower head is in shade, showing no contrast in flower head. Colour is consequently muted and contrast low. The focus seems a little off your central elements, but that may just need a bit of sharpening.