Lee Van Cleef inspired the axe-slinging Tinman, while the Scarecrow has clearly spent some serious time at the carnival. The Cowardly Lion is a Victorian gentlebeast, while Toto is a large, Cerebus hound.
Dorothy is a mechanic, just as one might expect.
If you like the poster the Monster Commute webcomic (first page HERE) may interest you too:
It’s our latest project. It’s a comic that is like 1984 meets the Wizard of OZ, on a steampunk highway. It’s a bit fantasy, a bit 1930’s dieselpunk, and it’s inspired by our real life commute in Phoenix, Arizona. It follows the adventures of Chadworth (robot), Beastio (daemon) and Kip (Halloween golem), through their adventures in MONSTRU. (The monster world.)
The Monster Commute website has all sorts of cool things (generally not fairy tale related, though there are some very interesting monsters...) as well as a fun web comic that will appeal to anyone who likes graphic design as well as those who like the lighter side of life (and monsters), so go browse if you get a chance.