Its really good but the wrinkles don't flow with the body pose, girl skirts are usually on their waist so the skirt line is supose to be straight. You have inconstant shading, for instance the breast would have shadows form one to the other,and the arm holding the thing have shadows above and below the arm while the skirt shows nothing despite the shirt being over it, final I can't tell what she is doing her face is not expressive, if she's sad try drawing some tears, or if is not that then maybe tell people in the summary.