This image appears here courtesy of the University of Texas Libraries, The University of Texas at Austin. It is free for your personal use.

Portrait of Michelangelo from The Hundred Greatest Men
Public Domain; Courtesy of the University of Texas Libraries, The University of Texas at Austin.
This portrait bears a notable similarity to the
work made by Jacopino del Conte in the 16th century, which was believed at one time to be a self-portrait by Michelangelo himself. It is from
The Hundred Greatest Men, published by D. Appleton & Company, 1885.