Horses are not my forte either, I like cartoon animals mostly and have never tried drawing a person although I may attempt to in the near future (Zachary Quintoyum) But we'll see if that ever happens!

Anyway, I am quite the fan of your drawings. I liked this one alot, I think you're being to hard on yourself. The only thing I can say is the leg looks a bit thin? But I have not seen the original picture, so I wouldn't know.