In The Last Judgment, a fresco found in the Sistine Chapel, Italian master Michelangelo fills a frantic composition with numerous biblical characters and saints accompanied by their attributes. One noteworthy figure is St. Bartholomew, who—as in many Christian depictions—is seen holding his own skin. In a fascinating twist, the face portrayed on the flesh is widely believed to be a self-portrait of the artist himself! [see added view detail]
The Last Judgment is in the Sistine Chapel in the Vatican.
[https://mymodernmet.com/famous-self-portraits/]