For Your Art Teachers: Open Access To 25,000 Images Of Works Of Art [US NGA]
Link: National Gallery of Art | NGA Images
Open access policy for images of works of art presumed in the public domain.
With the launch of NGA Images, the National Gallery of Art implements an open access policy for digital images of works of art that the Gallery believes to be in the public domain. Images of these works are now available free of charge for any use, commercial or non-commercial. Users do not need to contact the Gallery for authorization to use these images.