Your work is amazing, Have you studies in animal anatomy or is this self learnt? I know personally that after starting my animal science course my drawings have become a lot more realistic and proportional.
Im self taught. I have taken a personal interest in animals and love drawing them. It helps that I find it naturally more easy to draw things of nature. I have bought several books on animal studies and visited my local zoo (San Diego) to take photos and watch. Other then that, no real education. However some would argue my experience is more an education than one would receive sitting in a classroom.