Yay! Okay, for starters, the anatomy is nearly perfect, except for the top of the front leg. In the future, I don't think they bend outward like that. Also, the ear seems to come a little too forward on the face. That is all! Otherwise, this is a fantastic piece of art! :'D
Oh, the leg does look a bit weird, but it's just that I have some kind of obssession with drawing shoulders for the ponies, it happens in every single drawing I have D': Thanks for pointing out those details ^^ I'll keep in mind that whenever I draw ponies again.