'Tis (some of) the Discworld characters. From left to right, the top row is:
Sir Terry Pratchett (erstwhiel clever author) , Death, Susan (daughter of Death), Lord Havelock Vetinari (Patrician and tyrannical ruler of Ankh-Morpork), the Luggage and Rincewind (a wizard), the Librarian (an Orangutan), Moist Von Lipwig (Postmaster of the Post office), and One of the posties who I can't remember the name of, because I've only read Going Postal once.
From left to right, the bottom row is:Granny Weatherwax (a crotchety old Witch-supreme), Nanny Ogg (a boozing, crude lovable Witch –nearly-supreme) and Greebo (a vicious wolf baiting cat), Magrat Garlick (a hippy Witch), Sir Samuel Vimes (Commander of the City Watch, Duke of Ank-Morpork and Blackboard Monitor), Captain Carrot Ironfoundersson (6 ft 6 dwarf-by-adoption, Watchman, not-so-secret heir to the throne of Ank-Morpork), Angua (werewolf, Watchwoman), Fred Colon (fat, bit stupid, Sergeant of the City Watch), Nooby Nobbs (Corporal of the City Watch, has a certificate to prove he’s a member of the human race).
I'm not sure where I found this piece of art but I loves it.