Art, the colors and subject matter are spectacular. I love the angle that you photographed this at - it really draws my eye in to the center.
My one comment would be to maybe clip a little off the top. Since I can't see the entire back petal, I'd personally rather see a little less. That way my eye stops at the hard lines of the center and doesn't go back to the back petal where part of the hard line is missing. Does that make sense?
Do you remember taking this outdoors in natural light or if it was in indoor plant? It's beautifully lit and well exposed and that makes me wonder if it was outside or inside with flash or ???
I like the subject here. The colors are lovely. And I like the basic compositional idea. But it doesn't quite work for. Maybe it is the crop as has been mentioned above. Another crop might have worked better here.