For your first drawing it's not bad. Like I tell everyone looking for advice (myself included) the first place to start is to make sure the anatomy is correct. I'm doing a personal study/project right now focusing on just certain parts of a horse like the nose, the ears, hooves, etc. After I've done those and feel comfortable with my ability to draw them, I then focus on making sure they fit together correctly. Make sure the head is proportioned to the neck and the legs aren't too long/short in comparison to the body...that kind of thing.
Once you start with that base and get that mastered you've got a great foundation for drawing. Then you can focus on shading and such.
Great to hear you're drawing! Look forward to seeing more.
The aim of art is to represent not the outward appearance of things, but their inward significance. ~Aristotle