1. Amazing shot 2. Great composition 3. Perfect shading 4. Nice details 5. Great anatomy 6.100% on model! Constructive criticism;You could push your posing a bit further next time by planning each character's attack making your page or fight sequence more realistic. For example, Sabertooth's front hand could be grabing Wolverie's throat with other hand cocked back for a killing strike while Wolverine's front hand had already takken a slash at sabertooth core and back hand just the way it is now. Those are just my though as a comicbook fan, professional animator and 4th degree Taekwon-Do instructor. : )
I hope you are not offended by my comments. Overall great work!!!!