Here’s some great examples of monster-themed comic book covers. My criteria was basically covers that had interesting/striking compositions, displayed solid draftsmanship, telegraphed strong atmopshere and theme, and were just plain fun to look at because they are so odd in their presnentation (some of course have all four). The greats are also included in this gallery of covers: Jack Davis, Frank Frazetta and Wally Wood.
If anyone else has any other examples of monster-themed comic covers send them my way!