This character I did for my graduation movie is simply a mix between a sea turtle and a cooking pot. The dude has the capacity to hide itself inside its own body, and see its enemies through the glass of the pot. The challenging part of this design was the blending between organic and metallic parts, trying to keep the character flexible and agile. 
 

Software used : Photoshop, Zbrush, Substance Painter, Maya, Arnold, Nuke.

Concept art