I don't think you guys know what "be critical of your interests" means. it doesn't mean "know when the bad guy is doing something bad" it means "know when your favorite media is being fucking racist"
Library of Congress - historical posters and photos
NASA - you guessed it
Creative Commons - all kinds of stuff, homie
Even Adobe has some free images
There are so many ways to make moodboards, bookcovers, and icons without plagiarizing! As artists, authors, and other creatives, we need to be especially careful not to use someone else’s work and pass it off as our own.
Please add on if you know any more resources for free images <3