Very nice image, I have been using reflectors in some of my closeup shots and this one could use some reflected light from underneath front as it looks a bit flat and underexposed on the lower part of the flower, hiding some of the detail of the stamen and antlers.

Curious as to why you used ISO 400 and not 200, was there movement from a breeze?

What lens did you use? I have also been using some selective Gaussian blur to smooth out the background in shots where the bokeh could be better.

I think this shot has a lot more potential with a few tweaks.