This is one of my more recent pieces, and I want some critique on it! I really want to improve, so rip it apart!

Okay, so my major critique with this is the hair. White horses never have black hair. I recommend choosing a dark color from the horse's body and using that as the base color for the hair.

I know some great mane tutorials I can send you if you'd like. I've seen white horses with black hair on this game, I think the mane just has too many strands and not enough movement. I'd love to share the tutorials that helped me. Just PM me!

I agree here

also, I would lower the saturation so the horse doesn't have a green hue, since it's standing over ice not grass.