Drawing of Sofonisba Anguissola (aged around 92) from Anthony van Dyck's sketch book, July 12, 1624. Although Anguissola could no longer paint due to her failing eyesight, she continued to advise van Dyck on his painting technique.
The note surrounding the sketch reads,
"Portrait of the painter Signora Sofonisba, done from life in Palermo in the year 1624, on 12 July: her age being 96 [sic] years, still with her memory and brain most quick, and most kind, and although she has lost her sight because of her old age, she enjoyed to have paintings put in front of her, and with great effort by placing her nose close to the picture, she could make out a little of it."
He follows this with some notes on Anguissola’s tips on lighting and shadow. Later, van Dyck claimed that “he had learned more from a sightless old woman than from all the master painters in Italy”.