My answer : I personally can't choose between literally every Van Gogh's paintings (because I love his paintings so much) and The Garden of Earthly Delights by Jerome Bosch (https://en.wikipedia.org/wiki/The_Garden_of_Earthly_Delights#/media/File:The_Garden_of_earthly_delights.jpg).
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I personally love Monet, especially Woman with a Parasol (https://www.nga.gov/collection/art-object-page.61379.html)