I haven't been around much lately so I didn't get a chance to vote in this challenge but had I voted I would have probably started this out at a 7 and then possibly bumped it to an 8 if I had the chance to go back.
It's a lovely picture, the balance is well done and the contract is very well done. The bright white to the dark backdrop. The buds in the background are a bit distracting though to me personally. I like the shot, it would make a lovely print but the buds, especially on the left side are competing with the flower for my attention. If they were a bit darker like the ones on the right it might be better.
The crop also leaves me wanting just a bit, a tighter crop on the top, taking out that bud would really make this shot pop IMHO. I like the image but just a few tweeks and I would really love it!