Wow, those are amazing! The second one looks better than a photo with the soft lighting and personality that you've painted it with. The first one is fantastic as well, your attention to detail and use of color is perfect. :)
I feel bad saying any kind of critique for such a beautiful piece, but the cannon bone on his right foreleg looks like it might be a little thick, or it might be that the knee is a little low on the leg. Or maybe it's just me... either way both pieces are absolutely gorgeous! How long have you been painting horses?