Images (unless otherwise credited in the database or on the general website) are copyrighted and shared under the same CC BY-SA 4.0 license that applies to the text; in short, you can use an image for non-commercial purposes that appears on this website (provided there is not a credit line, an attribution in the caption, or any other indication that the image is courtesy of an external source) if you give credit to this site and follow the terms of the license. No permission is granted to use images on this site that are courtesy of an external source.
A word about images: there has been some back and forth about whether the images on this site should be copyrighted because the compiling of them, the editing of them, and even the photography of them represents a considerable amount of time spent in order to make the site usable. My argument against employing a restrictive copyright stems from the fact that the original sources of these images–the catalogs, advertisements, and The Craftsman magazine–all are in the public domain at this point. Copyright exists to protect the creator of an original thing for a period of time, but when a creation enters the public domain, it should exist there unencumbered by restrictions.