By English: Carole Raddato (Flickr) [CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons
Grand Staircase, Metropolitan Museum of Art CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/) Ralph Hockens (https://www.flickr.com/photos/rhockens/9864507985)
By Fcb981 (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/)], via Wikimedia Commons
Clair de Luna Alfons Mucha
Woman's face to right of moon - Postcard - Licensed under CC BY-SA Tuckdb Postcards http://tuckdb.org/postcards/90522
Egon Schiele - Nude - Public Domain
Le Sommeil (Sleep), 1866, Petit Palais, Musée des Beaux-Arts de la Ville de Paris . Gustave Courbet. Public Domain
By Jacques-Louis David - Web Gallery of Art: Image Info about artwork, Public Domain, https://commons.wikimedia.org/w/index.php?curid=348139
By Rufus46 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=38140793
By No machine-readable author provided. Thermos assumed (based on copyright claims). - No machine-readable source provided. Own work assumed (based on copyright claims)., CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=857879
Gustav Klimt [Public domain], via Wikimedia Commons
CC-BY Robert Salnave
By Taj Hotels, Resorts and Palaces (Taj images) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
CC By Timothy Norman - Ferry Island
CC BY Alejandro Gutierrez - Parc régional des chutes Dorwin