What websites offer resources for finding comic book art assets like backgrounds and characters?

Websites like Envato Elements, Freepik, and Adobe Stock offer a vast library of comic book art assets, including backgrounds, character illustrations, and props. Some sites also have free assets available, though the quality may vary. Pixel-based asset creators like OpenGameArt.org provide free assets often used in indie game development, which can be adapted for comics. Remember to check the licensing terms before using any assets.