There is no lean forward with a head and shoulders. The horse almost looks like he's trying to slow down or keep his head back from running into something. He's definitely not running head-first into the wind.
You could try making both his head and neck longer. This will help the anatomy. Have you ever seen BoJack Horseman? He's got a huge neck and giant snout. Your horse has a micro head.
Also his back leg closest to the viewer looks like it is hurt as if it's trying not to touch the ground are put any weight on it as if it were a dog with a bum leg. That affects how he appears to run to the viewer. Try adding some up and down motion on the head and back. Currently, there is no sense of weight which leads to the appearance of a bum leg, exacerbated by the fact that the leg doesn't seem to bend either.
Hopefully this helps.