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An RSS feed and mailing list too.
Museo is a visual search engine that connects you with the Art Institute of Chicago, the Rijksmuseum, the Minneapolis Institute of Art and the New York Public Library Digital Collection Every image you find here is in the public domain and completely free to use, although crediting the source institution is recommended!
This looks like another pupil friendly source of images. I’ve added this to the short set on my classes’ links page.