Curated OER
Reptiles, 1943
This site has several thumbnail images of Escher's artwork. Each can be clicked on and enlarged twice. Showcased are such popular pieces such as "Drawing Hands" and "Mobius Strip II."
CGFA
Carol Gerten Fine Arts: M. C. Escher
This resource provides a very informative biography as well as a gallery with 15 pictures of great Escher art.
Curated OER
Clip Art by Phillip Martin: Snake
Cartoon drawing of snake with its tongue sticking out.