Metropolitan Museum of Art Image Collection
You are welcome to use images of artworks in The Met's collection that the Museum believes to be in the public domain, or those to which the Museum waives any copyright it might have, for any purpose, including commercial and noncommercial use, free of charge and without requiring permission from the Museum.
Getty Photo Archive
The Photo Archive's two million photographs provide supplementary and original pictorial research for the study of fine arts from antiquity to the modern period. The archive's strength lies in the photographic reproduction of western art, architecture, and decorative arts.