License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Kuwagata Keisai 鍬形蕙斎. How to Draw Figures Simply (Jinbutsu ryakugashiki) 人物略画式, 1799, early winter (Kansei 11). The Metropolitan Museum of Art.