Really nice piece. You got really nice style! Hope you are taking some life drawing classes, I think they would push your work to the next level- then look out!!
Are you using non-photo pencils for your sketch, then a darker pencils over them, so that the non-photo pencils get removed during the scanning processes? Your lines always looks clean like there's no draft/rough sketch underneath. I'd love to see (or hear) your processes from sketching to scanning. Great job on the sketch.