“Mount Sinai” by El Greco (1541 – 7 April 1614), housed at The Historical Museum of Crete, assumed allowed under Fair Use.

 “Carnival of Mexican Life. Dictatorship” by Diego María de la Concepción Juan Nepomuceno Estanislao de la Rivera y Barrientos Acosta y Rodríguez (08 December 1886 -24 November 1957); image from the Palacio de Bellas Artes, Mexico City, Mexico, assumed allowed under Fair Use.

 “The Valley of the Nervia” by Claude Monet (14 November 1840 – 5 December 1926); image from the Metropolitan Museum of Art, assumed allowed under Fair Use.

  Image from Memgenerator, assumed allowed under Fair Use. I have no idea if the misspelling of “advice” is intentional.

 La Virgen alada del Apocalípsis (“Winged Virgin of the Apocalypse“) by Miguel de Santiago (17th century), assumed allowed under Fair Use.

 Section from a Qur’an, Iraq or Turkey, second half of 13th century, available at The Metropolitan Museum of Art, assumed allowed under Fair Use.

  “A Pastoral Idyll” by Louis Léopold Robert  (13 May 1794 – 20 March 1835), assumed allowed under Fair Use.

  A page from 11-th Century Irish manuscript Stowe Missal, image from Wikipedia, assumed allowed under Fair Use.

  Capri mit Blick auf Santa Serafina, by Johann Wilhelm Schirmer (5 September 1807 – 11 September 1863), assumed allowed under Fair Use.

Standing Buddha, ca. 3rd–4th century Pakistan (ancient region of Gandhara) at the Metropolitan Museum, assumed allowed under Fair Use.