These are a couple of my first ever notans. I used Tombow E15 (black) and N65 (grey) brush pens, and the white of the paper. (Odd how the highlights look white but the blank paper outside the borders looks grey. Must be a trick of the eyes—or my crappy phone camera.)
I didn’t focus on design in these so much as just trying to capture the right (simplified) values. I can see how this will be a really helpful exercise.