Looking pretty good. I have a few small suggestions, though:
-The color looks fine. However, if you are worried about it getting boring, the Centigors seem to have portions of thicker, darker fur in the images on the GW website. The hair is of a darker color on the stomach, back of the legs, and on a strip running from between the horns, down the spine and through the tail. If you are worried about the color being monotonous, adding that could help.
-The Centigor's horse-body seems situated too low to the ground. The models have longer legs, and the horse-part of the body seems to connect at the stomach-level of human portion, rather than at the hips where you have it situated presently. It makes it look stunted and squat.
-The shield looks a little large, too. But I don't know if you did that for the civ-color or not.
So, yeah, those are my critiques. Hopefully they'll be of some help.