Michelangelo's Irreparable Loss Gives Insight to his View of Sculpture
22Published as Sonnet LXI "Irreparable Loss" in John Addington Symond's more poetic translation: https://archive.org/details/sonnetsmichaela00symogoog
Art historian Frederick Hartt discusses this sonnet in relation to Michelangelo's sculpture in his introduction to "The Complete Sculptures of Michelangelo." https://www.scribd.com/document/251045505/FREDERICK-HARTT-Michelangelo-the-Complete-Sculpture
A more literal translation and discussion of this sonnet published by Columbia University: https://arthum.college.columbia.edu/sites/default/files/PDFs/arthum_michel_reader.pdf
I found the portrait of Vittoria Colonna via Artsy.net's article on her relationship to Michelangelo: https://www.artsy.net/article/artsy-editorial-michelangelos-tender-friendship-renaissance-poet-vittoria-colonna
The thumbnail art is my own personal study of the hand of Michelangelo's David from the plaster cast at the Victoria and Albert Museum in London.