I would leave the horse's mask as-is for the time being and color in the rest of his outfit before worrying that it doesn't look that good. It's premature to judge at this point, I think.
Hopefully you've still got all the colors/materials as a seperate layers so if you need to change them it's no big deal.
Hopefully you've still got all the colors/materials as a seperate layers so if you need to change them it's no big deal.