License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Isoda Koryūsai. The Courtesan Sayoginu of the Yotsumeya Brothel, from the series “A Pattern Book of the Year’s First Designs, Fresh as Spring Herbs” (Hinagata wakana hatsu moyō), 1776. The Metropolitan Museum of Art.