I did it differently...I actually did to my drapery what we were doing in class, I divided it in those rectangular kind of planes, it ended up looking like a spider web, and I didn't like that, but I thought that was what we are expected to do..
so here I am ...starting from scratch.
my charcoal pencils stopped getting along with my sharpener, and I started using knife to sharpen them. It works so much better!!