There are a lot of photos I am not voting on, this is one of them. I am not sure if you wanted to show an emotion or fear or what with this photo as it relates to 'darkness' other than the picture is shot dark. I didn't think it fair to knock your score because I couldn't see your concept. It is a good picture, I just can't relate it to the challenge. Good luck!
Looks like the red channel blew its highlights a bit, and some detail was lost in the flower's center. These can be very tough to photograph and retain 100% detail in, especially given the toneality range in this shot which definitely exceeds most digicams. A nice composition though, and I like the petals fading into shadow.