"ARTstor images are available for strictly pedagogical and scholarly purposes, as outlined in our Terms of Use. No ARTstor images may be used for publication or commercial purposes." - From ARTstor Digital Library FAQs
The library's image databases are databases that the library subscribes to. They are generally going to have more high quality, high resolution images than images you find through Google or other free image websites. Some of the sites listed on the Image Websites tab DO have larger resolution files.
This is a list of some image databases related mostly to art and design, but if you need more or other types of images, for example medical, historical, multi-cultural, there are many more on the Image Databases page.
Coverage of world fashion from 1500 BCE to present. Contains reference works, ebooks, and images.