Compositionally, I like how the flowers look random, yet are balanced. The higher one serves as an immediate focal point, but then the eyes are drawn to the ones in the lower right. Also, there is the contrast between 1 and many. I don't know that I can/would suggest anything to change compositionally.
Technically, you have done well, also. You've met the challenge well, and I like that it is basically silhouetted, yet some of the color of the petals and stems "shines through." I'm not sure what you are using for a background, or what your options are/were, but the picture screams "YELLOW" to me. (If this were a yellow challenge, I would almost put money on this being a winner). I'm wondering if a blue background would give it a little extra contrast and interest?
Great score and placement, deservedly so.
If you have any questions, or if I need to further clarify or explain myself, please pm me.