Another very nice drawing. The rider's upper body is far too large and i think his leg would turn out more. The clouds, while great, do not transition into the grass well or around the horse. The composition is also much better. Have you considered illustrating in ink? a painted wash would really compliment your style.
It's quite flat, the shading doesn't lend much of a sense of shape to things. Really I mean, you need to do the same thing every other artist does, draw from life, and apply the knowledge learned to everything else you draw. You should find an illustration-focused forum and post your work up for critique there constantly,…