Studies for the Libyan Sibyl (recto); Studies for the Libyan Sibyl and a small Sketch for a Seated Figure (verso) by… https://www.rawpixel.com/image/9184318/image-dark-academia-john-singer-sargent-frescoFree Image from public domain licenseStudy of a Nude Boy, Partial Figure Study (recto); Study of a Seated Man (verso) by Pontormo Jacopo Carucci https://www.rawpixel.com/image/14246687/image-face-person-churchFree Image from public domain license