The thought my mind creates when I see this is the one on the left is devoid of emotion but has something bad planned for me. There is thought there. I have her focus. She is the one who leads the 2. The one on the right is further devoid of emotion and also devoid of thought. But when the one on the left attacks, the one on the right will follow and will be extremely brutal.
This is beautiful! I am not sure what program you used to edit this photo but for the sake of professional commonism I am going to assume CS3/4/5/; I wanted to mention how some of the burn/dodge work gives the photo somewhat of a creased look. It gives me a really cool vibe that the picture was tucked away as if it was being kept from eyes to see maybe like a curse or something. I can't really explain in words the vibe I get from looking at the photo but I can tell you that it is great!
The models look similar [twins perhaps?] yet they both have very distinct and individual personalities. I also love the old building! I've had the chance to shoot in some old buildings as well as a closed and condemned hospital(talk about eerie feelings) and it was absolutely fantastic!