When you search for images on JSTOR, you can now find over 3.2+ million images licensed for educational use and more than 800 additional collections alongside JSTOR's books and journal articles.
They have also made it easy to organize and annotate the content you find on JSTOR, and export, present, or share it from there.
If you already have a JSTOR, you're set! If not, registration allows you to save and download images and articles.
Find links to more collections: https://www.acasaonline.org/museums/