Many sites erroneously say this is a self portrait by Michelangelo.
According to https://www.wga.hu/html_m/c/conte/michelan.html it is a portrait of him.
Michelangelo, was portrayed here at the age of 65 by his relatively unknown compatriot Del Conte.
[http://www.artsalonholland.nl/manierisme/jacopino-del-conte-portret-michelangelo]
(Although no image is shown for this caption, I believe it refers to the image above. [sh])
This portrait shows the artist Michelangelo Buonarotti bust-length, facing three-quarters to the right, with his head turned slightly to the right. He is wearing a black coat with a collar. The painting is a feeble copy of an original portrait by Jacopino del Conte which probably no longer survives. A version of the portrait in the Uffizi, Florence, is inscribed with Michelangelo’s name; a second version bears the date 1534, which is likely to be that of the original. [https://www.royalcollection.org.uk/collection/402664/michelangelo-buonarotti-1475-1564]