Unless I am mistaken, these are two different hand drawn angles of the pack animal of Tatooine, called the Dewback. A creature especially rugged for the harsh, desert regions of the planet, it can survive off of mere moss for a food source, if need be. Natives tend to tame these beasts in order to help with transportation of objects and to do farm work.

To find more information about the Dewback, please visit the official web site's page at:
http://www.starwars.com/creatures/dewback/