Monsters Mash, an art jamming session, is welcoming unique monster illustrations for an upcoming artbook. Deadline is Oct 29.

Check out more details at http://www.digitalarttutorials.com/forum/viewtopic.php?f=5&t=3955

Tales of Amalthea might be worth checking out if you're into creature design.

It's a creature design course from Terryl Whitlatch, the creature design artist for Star Wars. You can get the first chapter to try out for free with registration.