4, 1 ....5, 3, 2 (from like the most to like the least order).
I think the "aggresive" facial expressions in 4 and 1 is what makes them my two favorite. Add that with the dark hair and dark makeup and it makes for very appealing imagery.
In 5 and 3 the hands mask the models mouth and lessen any degree of aggression that might be felt.
In number 2, the model's expression just looks too "mellow" (not that looking mellow is a bad thing, its just that mellow and "dark" don't flow well together to me............if that makes any sense). Regardless, they're all nice pictures though.
I will say one thing, the model definitely has some nice teeth...nice and white. Let me go find my tooth brush and get to scrubbing (smile)