I have enjoyed your many posts. If you are serious about a serious reply, then I will lay it on you.
I have been drawing horses since ever I can remember. And have drawn more than I could possibly count. What happened to them? 99% of them got thrown in the garbage. But, I learned from each attempt and that is my number one piece of advice to you;
Get some really cheap paper, some good pencils or other drawing medium that you like, and draw and draw and throw away. You see, if you worry about the finished product, it will become so precious to you that you will be afraid to strike out and make mistakes in the the effort to try new things. Never let the blank, white paper stop you. Don't worry about what comes. You pick up your pencil, hover over the paper and think about a horse; maybe stretching it's head down to graze. Or, striking off in a canter. Feel the way that the horse shifts it weight and where and how the energy flows from the first foot on the ground to the next and the next. It is this line of energy that you will want to draw first. Kind of like the spine and the leg from which the horse is pushing off. Everything else will flow from there.
Don't go too slow. Move briskly and if it isnt' right, toss it aside and draw another. Just go and go and see what comes out of the spirit. Out of 10 or 12, you may get one good one. But it will be alive!