The title says it all. Check out this amazing artist's chiaroscuro work. Oooooh, chiaroscuro... that's the kind of vocabulary a couple of years of art school will buy. Money well spent.
phenomenal! I can't even begin to imagine how much thought goes into these
 |  |  |  |
He would originally draw the image as if it was flat like a real picture. Not at that funky angle.
Then he would use that as reference. He would take another paper with all his guidlines and such, and redraw it skewed. For all i know he coulda used a computer to skew his image.
But originally it is drawn normal.