Skulls: eleven skulls arranged on three shelves. Photograph. https://www.rawpixel.com/image/13963517/skulls-eleven-skulls-arranged-three-shelves-photographFree Image from public domain licenseA bullet in the base of a skull, viewed through x-ray. Photoprint from radiograph after Sir Arthur Schuster, 1896. https://www.rawpixel.com/image/13995464/photo-image-paper-shadow-personFree Image from public domain licenseAnimal skull, deer antler sticker collage element clipart https://www.rawpixel.com/image/7090419/image-sticker-vintage-illustrationsView license