Thank you so much for the quick reply and detailed critique! I do draw other things than horses, though I view these as some of my better work so I decided to share those :)
In those drawings, I worked from a reference. I do draw horses without a reference but only in sketches, not when I'm trying to get a really detailed appearance with more accurate shading. Here's some other stuff I've been doing.
This was an attempt at ink painting, and watercolors.
https://pbs.twimg.com/media/BjBnom-IQAEtdYY.jpg
This one's just a sketch with quick colors. I didn't use a reference which you can probably see since some of my anatomy was a bit awkward.
https://pbs.twimg.com/media/BigAUGvIgAA1VTO.jpg
I actually started this one at the beginning of this school year, around September.. But never really continued with it like I planned. But here's a better example of my pencilwork with people.
https://pbs.twimg.com/media/BiOE8HMIUAAkkzZ.jpg I only had a ticonderoga on hand when I was starting it so it could definitely be improved some if I got out my nicer pencils. :)