Wonderful image. I could see how on an uncalibrated monitor that your subjects might get lost in the darkness, but on mine they look awesome. Fantastic colors and a wonderful warm feel to this. Very nice.
The bend of the 2nd silhouette is marvelous. Big fan of gold tones. Seriously, I like how the individual on the left isn't straight up and down. Breaks a lot of tension in an otherwise static photo.