Bronzino. Descent of Christ Into Limbo. 1552. Refectory in Santa Croce.
This fresco includes many likenesses of Florentines contemporary to the artist (McCorquodale, 72). The figure in the foreground in blue strongly resembles Eleonora of Toledo. Also depicted are other Renaissance painters, Pontormo and Bacchiacca, literary writer, Gelli, and a self portrait of Bronzino himself (Gaston, 47).
References
Cecchi, Alessandro. Bronzino. New York: Riverside Book Company, 1996.
Gaston, Robert W. “Iconography and Portraiture in Bronzino’s ‘Christ in Limbo’.” Mitteilungen des Kunsthistorischen Institutes in Florenz 27 (1983): 41-72.
McCorquodale, Charles. Bronzino. London: Jupiter Books, 1981.
Hidden Portraits of the Medici 
Do you think the guy leaning over directly behind the supposed portrait of Eleonora looks like Cosimo I?
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