I'd say that it isn't terribly off, windows give off very diffused light, so the graduation from the shadow to highlight will be soft, and you it looks ot me like you put the shadows in the right areas as far as under her neckline, cheek bone, eye sockets.

I think the shading on the balls in the necklace looks opposite though, the light coming in the window would be brighter than the light inside the room during daylight, so I would have put the shadows their on the opposite sides.

I think something else that would help is if you had some more contrast, getting a cheap charcoal pencil to practice with in addition to your graphite would help you get a better defined shadow. It would put a bit more dramatic emphasis on it if it had true blacks in their.

I'm glad to see that you are still really trying, this looks a lot better to me than what I saw before

You may want to practice your lighting on a more simple subject, like a still life with a simple desk lamp or something aimed on it in the dark. Those sorts of excercises will help train your eyes.

As a photographer it's a little hard to critique because you are drawing what the human eye can see, which is a much wider range of shades than a camera. In photography, the window would either be much brighter than the inside room or much darker on the inside, as cameras don't have such a wide tonal range as the eye, unless of course it has been manipulated highly or very very carefully metered and developed, which is rare unless professional or master student.