the anatomy is straight on there is a lot of movement in this drawing.
I like the somewhat ... I don't know how to call it... look of the painting
not all smooth (I hope you do understand what I mean hehe
very nice how you did the blue behind the horse and red behind the rider, only the blue going into the red is a bit ... sudden ... you could make that a bit more smooth by putting in a few colors between the red and blue.