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| Guercino (Giovanni Francesco Barbieri) Prophet Ezekiel 1626 fresco Duomo di Piacenza |
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| Guercino (Giovanni Francesco Barbieri) Prophet Micah 1626 fresco Duomo di Piacenza |
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| Guercino (Giovanni Francesco Barbieri) Prophet Micah (detail) 1626 fresco Duomo di Piacenza |
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| Guercino (Giovanni Francesco Barbieri) Compositional Study for the Prophet Micah 1626 drawing Musée des Beaux-Arts, Besançon |
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| Guercino (Giovanni Francesco Barbieri) Compositional Study for the Prophet Micah 1626 drawing private collection |
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| Guercino (Giovanni Francesco Barbieri) Compositional Study for the Prophet Micah 1626 drawing private collection |
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| Guercino (Giovanni Francesco Barbieri) Compositional Study for the Prophet Micah 1626 drawing Ashmolean Museum, Oxford |
"Carlo Giantomassi, in his summary report on the restoration of the frescoes in the cupola carried out in 1983-84, remarked that when Guercino started the Prophets some hesitancy was detectable in his touch, but this tailed off once he picked up speed. The earlier compartments of the cupola certainly took him longer to finish, requiring some twelve giornate in all, rather than nine by the time he was ending the series. (A giornata is an area of wet plaster preparation that could be painted in the stretch of a single day.) In a concentrated painting campaign lasting three months, Guercino finished all six compartments with Prophets by late September 1626."
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| Guercino (Giovanni Francesco Barbieri) Prophet Jeremiah 1626 fresco Duomo di Piacenza |
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| Guercino (Giovanni Francesco Barbieri) Figure Study for the Prophet Jeremiah 1626 drawing Museo del Prado, Madrid |
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| Guercino (Giovanni Francesco Barbieri) Drapery Study for the Prophet Jeremiah 1626 drawing private collection |
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| Guercino (Giovanni Francesco Barbieri) Study of Angel and Putto for the Prophet Jeremiah 1626 offset drawing private collection |
– quoted text from The Paintings of Guercino: a revised and expanded catalogue raisonné by Nicholas Turner (Rome: Ugo Bozzi Editore, 2017)