Tentatively, SuperJoshua.com. Primarily, my working through the book, The Natural Way to Draw, by Kimon Nicolaïdes.
I managed to mentally scale this one to actually fit on the paper. That's an accomplishment in itself. Shallow folds kind of bother me. With my eyes, I pick up on them, no problem. But with four colors (no shading), I don't believe I'm really expressing where the folds are. The only places where I'm feeling halfway positive about are the places with a lot of movement and the undercuts.