Bumping into enough bears, grizzly and black over the years, and my wife a wildlife photographer..I’d try some warmer yellow tones on the snout, some variation in darks for the main fur: blue or green..to give a black bear..or for the griz look go reddish...then change up the fur on his shoulders to grey as say a wolf skin? Black bears tend to have more uniformity in colour look..whereas griz tend to look more streaky if that makes any sense ..griz paws are very clearly more nasty looking than black..blacks also coming in reddish cinnamon ..and griz have amhump to of shoulders that’s usually distinctive. Could always go for most elusive griz..spirit bear ..in whiteish warm grey...anyway, other than a few highlight, need not highlight each bit of fur..
It’s darn cool piece you have there..framing of the face works well..don’t lose sleep over the fur..I like what you have going..