The spine of the figure seems to be in a distracting "S" shape. I've been a fan of yours for a while, so I know you've got a very distinct style, but improper skeletal structure takes away from the effect. Looking closely I can't find any pencil marks to indicate that you started with a base figure. Even when using a reference I've found it essential to lay down a gestural pose. It will make the final product more believable. It's also useful for fashion design because the clothes will have a body to drape and hang upon.
The idea is pretty fun - a fairly fancy looking woman posing next to a rustic farm animal - or rather a notoriously thin fashion model next to a literal cow. To develop this further I would suggest finding some cow references to really play up the contrast.