The only thing I find "weak" in the piece is something about wolvies pose. I think it mostly has to do with his right leg, maybe if it was bent back. Like all his other limbs carry him forward but his right leg pushes him up, and seemingly away from Sabretooth. If the leg positions were the opposite it would make more sense to me, but what do I know, it's still a dramatic piece with plenty of motion.
The lines are gorgeous, and the colors slick, the light coming through the treetops is great.