All right. The shading here is a little weird, there's a shadow on the inside of both legs, so, Where's the light coming from??? Only other critique is the hands, they both look a little off, especially the back one. Well done, though!
I do like your anatomy although her back looks a bit too curved. Her hair is nice though. Her face does look a bit strange though, her expression is vague and her cheek and jawbone go into a point which looks weird. Also maybe add some detail to where her collarbone is. Collarbone's are a very prominent part of the body and should nearly always be shown. Maybe also add some sharper creases to her skirt to add movement/flow.
I would also suggest putting on a mild background or shadow against the wall, white is a bit too boring and plain.