Good picture but...
I hope you weren't claiming you thought it up on your own from watching Silence of the Lambs. It's Fuseli's "The Nightmare", one of my favorites.
http://upload.wikimedia.org/wikipedia/commons/5/56/John_Henry_Fuseli_-_The_Nightmare.JPG
Still i really like seeing classics all done in pencil. My only suggestions would be to give credit to the original artist and use black in your greyscale.