https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14007361
The artist Paulus Potter sketching a milkmaid milking a cow, watched by a group of onlookers. Engraving after E.M.E. Le Poittevin.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use