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I have found the himalayanart.org website, which has the kind of art I am looking for, things like religious paintings, mandalas, etc. Where are the most digitized high-res buddhist art records kept online?
You can try the U.S. government's Library of Congress.
For e.g. you can download a 16MB JPEG file of the Gandhara Scroll or 2MB sized JPEG of South Korean Buddhist Rock Carvings.