this is beautiful. the colors are very, very soothing. somehow, though, i think the far background is a bit of a distraction; those lines really take away from enjoying the simple beauty of the flower. but, that's just my opinion. you have a wonderful image, and i hope it does well for you in the challenge. good luck!
Using on the natural light dulls the richness of the flowers colours. Some additional light might have puched this up and enhanced the result. I like the DOF.