Newspapers can be good sources for photographs, editorials with images, advertisements, cartoons, and other images. If you're looking for a specific newspaper, use the Journals & Newspapers search to search it by title, and see what database it's in and for which years we have access.
These databases have collections of newspapers published generally pre-1990, often digitized from print or microfilm. They are searchable, but be aware that the results won't be as accurate as born-digital newspapers.