https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13960243Edit ImageSaveSaveEditCropCustom TextSheep's head showing signs of smallpox. Coloured etching, 1840/1860.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 968 px | 300 dpiLarge JPEG 3056 x 2464 px | 300 dpiFree DownloadSheep's head showing signs of smallpox. Coloured etching, 1840/1860.More