Contrast and negative space are the strongest aspects of this from my viewpoint. I like the lighting which is subtle. My only negative and it's picky, is that it's a bit busy.
The lighting on some of the blossoms is exquisite. You definitely found a nice specimen to shoot and some great lighting to boot. The balck backgrouns behind the white petals is perfect. This is not really that "macro" so it would have been better to get close on the blossoms with good light. As it is, almost the left half is a jumbled OOF mess.