Her right arm should be bent, not outstretched, if you want her hand on her knee... But in any case, this pose is incredibly uncomfortable. Why would you prop your leg on a rock and lean backwards instead of forwards?
As mentioned, you need a horizon line. If the feet are almost at eyelevel, the base of that tree (?) should be definitely be at eyelevel.
Proportions are an issue as well.
"During youth, the desire for self-expression is so overpowering that most people end up by losing all grasp on their real selves." - Akira Kurosawa