Films on Demand, access provided by Foothill Library, has a rich source of films and film clips on mythology.
Search first using the term mythology and then narrow down by adding terms related to your topic.
IMDB has a list of movies using myths as a basis. It has 100 listing but it isn't easy to isolate as to myth type or subject.
Taste of Cinema gives its opinion of the best foreign films with myths as a subject.
Mythology- the Celts: On the Screen Reviews provides a short list of movies with a Celtic theme.
E-books and Articles:
Search the Foothill Databases using the Subject: Myth in Motion Pictures
Search Books : Comics & Graphic Novels : Graphic Novels : "mythology"
Use your favorite search engine to search for : graphic novels using "insert type here" mythology
Example: graphic novels using Indian mythology
got the result: