You've done a beautifully moody image here. It fits the Challenge perfectly, tells a good story, and is nicely photographed, especially under the Basic Rules.
You've placed quite well in a large field of entries. Anything over 6 is pretty good pickings.
One of the problems with a "dark" image is that some of our voters do not have perfectly calibrated monitors and I think this may well have worked against this fine image. If they could not see the subtle detail - which most certainly is there - they are going to vote low numbers.
While that's the nature of the beast, it does not detract from the excellence of your work.