Scratchboard.

This drawing didn't come out quite as intended. Per my concentration, your eye is supposed to be drawn to the vast empty space the person is looking into. Instead, the person takes up too much of the space. I should've made the person much smaller, squeezed way into the bottom corner of the picture – only about one-tenth as tall as the full picture, instead of one-third as tall. Then it really would call attention to the 99% of the surface that I left in darkness.