You are pretty decent. As an artist I can tell you a few things: left arm shading is off. Shading on edge of clothing is nonexistent. Clothing lacks "fabric" look caused by female bust. Gradients and levels are non existent on body/clothing. Lack of shadow cast by hair. Face looks pretty good though. You have natural talent however.
I think it would help if you do some studies on form, perspective, anatomy. This is one of those ambitious drawings where it shows you haven't quite got the hang of all of these yet, but taken beyond an abstract kind of line art (the shading kind of conflicts with any sense of stylization).
It might help if you focus on line art for a bit, and focus a lot on proper anatomy and proportions. Don't just draw from your imagination -- it's critical to use proper references for everything if you're going for a realistic or pseudo-realistic style (which is generally what you want to be focusing on first before stylizing).
A few tips. Pay attention to where the light is coming from and shade accordingly. Her hair should shadow her neck more and the shirt apparently isn't affected by light at all. Also don't outline the body so much. If there's no line in real life you shouldn't have a line. Not trying to be harsh. Just giving pointers.
You've got potential, but definitely work on perspective--it's hard, I know. You can create a lot more depth by shading even more, so try working on that as well. But you're onto something good, I'd say. :)