https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13962177
Skulls: twenty-one skulls or parts of skulls arranged in four rows. Photograph.
Skulls: twenty-one skulls or parts of skulls arranged in four rows. Photograph.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use