Artsy recently announced the launch of Artsy Education and the ability to download 25,000+ open-access images.
Powered by The Art Genome Project, Artsy is a free website with a library of 50,000+ images from 650+ museum, nonprofit, and gallery partners, social media tools for telling stories about art, and e-commerce functionality to facilitate gallery sales and institutional fundraising.
More information about downloading images from Artsy is available here.