Raptor like toes on the left foot (From the character's view left, right side of the picture.) his expression greatly matches his posture and his clothing. By the clothing itself I would have assume Indian, even with those hands and tooth necklace, but something the face throws everything off... I'm not sure but it may be lack of hair. An awesome picture for me that reads as: City Wolf Assimilated into native American culture. :3
Very cool pose there. I like how he's kind of cracking his knuckles, getting ready to shift in any direction in a split second... You can feel the tension in this shot. And yet, his jaw and his features seem relaxed. He's not tense himself; far from it. He's ready to use that knife, and do so in a cool, collected, and controlled way. Whoever he's facing down will be dead within maybe--hmm... I'll give them three moves to live if they attack.
And yet... Look at his eyes and the corner of his mouth. Reluctant, yet determined. He knows this person. Maybe they're a rival, or maybe even an old friend. He's going to go for a knockout shot if he can. He knows, deep down, that if that person died by his hand, his world would change.
His hackles aren't raised. Not only is he calm, he was expecting this. And now, he's following along, probably because he saw no other option. There's something else at stake, and he's being forced into this situation to preserve it.