Easter Island Moai Style Head pictured on Mars by Curiosity Rover?

Easter island Moai head on Mars? It is from the latest Curiosity SOL 685 and it seems to show what looks like a giant head carved out and setup on the hill in the distance like we find here on Easter Island on Planet Earth.

Is it just an illusion or is this giant carved head proof that once Mars was inhabited by intelligent ancient civilizations?

Note: According to Zecharia Sitschin who studied the Sumerian Tablets for 30 years, he states that according to the Tablets, the Anunnaki sent over 30,000 of it's people to Mars, as a temporary station on the trip to planet Earth.