Lower jaw seems is out of proportion, should be a little bit smaller than the upper jaw... but on the other hand it adds to the creepy value. Other than that I think that characters on the second plane lack a bit of that orange/red light on their backs and sides which would be the reflection of the fire and red light behind them. And I don't quite see the source of light casted onto the werewolf's face but god damn nevermind that because it looks just freaking gorgeous!
That aside I really love it! It's so moody I can almost feel the cold of the night, smell the heavy air overflowing with stench of the blood and hear the ambient screams somewhere in the distance. Composition and the mood are just too great!