Again I want to celebrate the hatching progress!
Also horse proportions are hard. I was a horse nut growing up and I have drawn hundreds of horses so I know od what I speak. And I think you are doing well!
I was actually a bit lucky with the proportions. The reference picture is an adult horse, but I accidentally drew the head and hooves a touch too large. Now it's a yearling. Pshh, don't tell anybody!
Nice job on capturing the animal spaces and relationships of this horse here. Very good job on recording the proportions and angles in motion.
Well, I have one teeny-tiny, itsy-bitsy, littler thing that still bothers me a little bit. That little ankle between the left front hoof and the left front foreleg is a little bit too much rigid and unnaturally bulbous. (even in terms of the gestures and lines of that joint right there, but otherwise, it's a greater blessing) Would you please be a little more boldest and the most dynamic with your horse ink-brushstrokes with 5 minutes of 29 second animal line gestures and gesture sketches, in addition to Drawabox.com exercises??? (300 seconds/29 secs=about 10 drawings)
The reason why you could help youself improve your animal gestures of anatomy is as a result, to keep your horse looking more than just the simplest animal anatomy diagram, you'd be able to observe and caricature the most strongest lines of action and the most stronges lines of rhythm of your equine bone and muscle structures, and their line art, too.
Good luck to you, and I hope you've found this definitely and absolutely helpful and informative.