Are you using a reference? The jaw is far too low, it looks like he has heavy jowls. The ear needs somemore work, and the snout needs working on as well. It's alright but really, find a picture of a horse and follow how you see it.

That's what I have been doing. My little Carmargue horse is a reference! I know that it's jaw is low, it'll show that in a female Carmargue horse, that's one of their most distinctive features, their long necks and big jaws. The ears detail... and actually... ALL of the detail will be added when I have done the colouring. Trust me on this one, I know alot about horses.

this is such a cute pic i love it awwwwww!