First off, I love the idea behind the idea of the design and the elements you placed to surrport that, Like the wings for example. However there are a few details that can be fixed, like the eye. The eye's placement is to far forward and should be more towards the cheek. Also the horses eye should be parallel to the head position. Furthermore the inner back leg should be moved more to the right, so the horse doesn't look like it trapping. One other thing is that even though you don't have a background you should at least have a directional source of lighting instead of an undefined and inconstant lighting. The wings need fixing too, I think with more structure and making them big enough to carry the horses weight when he flys they will be perfect. I recommend you use a reference for the wings. But, overall the artist does show a good command over horse anatomy, and has nice movement going though the figure of the horse. I also enjoyed the pic and can't wait to see the finished product. Keep it up !!!!