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Egon Schiele's 1912 "Self-portrait with naked shoulder pulled up", in the Leopold Collection, Vienna.

Photo: akg-images

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Caspar David Friedrich's "Self-portrait with cap and visor", 1802, in the Kunsthalle in Hamburg.

Photo: akg-images

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René Magritte in 1967.

Photo: akg-images / Daniel Frasnay

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Angelika Kauffmann "Self-portrait", 1762/63, in the Uffizi in Florence.

Photo: akg-images / Rabatti - Domingie

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Pórtico de la Gloria of the cathedral in Santiago de Compostela: the middle pillar with a man kneeling and praying, the so-called "O Santo d'os Croques", which, according to local tradition, is Master Mateo.

Photo: akg-images / Andrea Jemolo