Arnold Böcklin, Swiss
Medusa on Instagram #NoMakeup, 1878
Oil on wood
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MASTERPIECE #1447
Arnold Böcklin, Swiss
Medusa on Instagram #NoMakeup, 1878
Oil on wood
Thanks!
Museum online page (Google translated, Bing translated) says it's oil on wood/panel. I've updated what I think was the source for this, which had previously said it's oil on canvas.