A smallish sketch on gray-toned paper. The image was taken from Four and Twenty Blackbirds.
Here are two recent sketches I’ve done of Poirot, one from season 1 (Four and Twenty Blackbirds), and one from season 13 (Dead Man’s Folly, the last episode filmed). They’re both done on gray-toned paper with a white pastel pencil and a Kimberly 9xxb– graphite pencils don’t come blacker. 🙂