Just want to say I really like it over all. What pops out to me is the shading detail, it's very nice and really gives it that outward appearance that grabs the on lookers eyes. The way the woman and horse are paying attention to different things tells me there are a lot of different things going on that we can't see, and that gives the on looker something to imagine, so it simply doesn't stop just at this picture.
I like the woman's facial detail, there is something a little ghosty in her eyes... it makes her look cold and sort of disconnected, but not in a bad way. The horse looks a little clueless, and I would have liked to see a little more detail in his eyes... but it certainly doesn't hold this drawing back. I really like how his neck connects into his chest, he looks like a really nice horse! And that saddle, I'd love to take a ride in it
Overall, very nice drawing, I'd like to see more work from you in the future.