This is the ad/cover of Monsters By Email - Creature Set 4.
This was the last set of Subscription Period 1, which is now over.
Subscription Period 2 has begun, with a really great offer for first-time subscribers.
If you like creature art, role-playing games, or want to improve your art-skills, you should check it out: [link]
Basically, you only pay if you're happy! : )