not really sure what is happening to the fur on the chest, that is the biggest problem area when it comes to the specular. The legs look pretty decent specular wise, but that might be because of the pose and the lighting. the horns are awesome though and seem like they got a kind of polish to them.
personally i think you would have benefitted with going away from the concept slightly, basing the character proportions around the refs that you got, but adding more loose hair and fur and giving him your own personal tauren touch instead of just showing that you can make accurate models from a concept.
good modeling although, but give the specular layer another go
