The guidelines offered here should be taken as suggestions, not as legal statements.
The re-use of images for educational purposes (not including print or electronic publication of any kind) is generally considered acceptable under the terms of fair use. If you wish to publish images online or in print, even if for educational purposes, you will first need to determine whether or not the image is protected by copyright, then find out how to get copyright clearance.
When in doubt, consult the Fair Use Definition (U.S. Code TITLE 17, Chapter 1, Sec. 107).
You may also need to obtain permission to publish from the institution that owns the image in question, whether or not the image is in the public domain. This is particularly the case for images found in licensed databases, such as ARTstor. ARTstor has a very clearly-worded permissions statement, as do other licensed databases. In most cases, you will need to write to the institution that owns the physical image (that ARTstor, for instance, includes) and request permission to publish it. There is often a fee associated with acquiring permission to publish.
Metropolitan Museum of Art images [and other IAP(Images for Academic Publishing ) program images] in Artstor http://www.artstor.org/what-is-artstor/w-html/services-publishing.shtml
National Gallery of Art Images, https://images.nga.gov/en/page/openaccess.html
LACMA (Los Angeles County Museum of Art) has 20,000 images avaialble free of copyright restrictions. https://www.lacma.org/image-library