The Face on Mars is the face of Alalu, ANUNAKI World Emperor that was overthrown by the Law of Inheritance, and the title was given to his cousin or half-brother ANU (of which the ANUNAKI are named after).
When ALALU was overthrown, he escaped in some type of ship and flew and described all the planets and asteroid belt.
ALALU made it to EARTH, and was able to barter for his survival with establishing the first outpost on Earth and allowing small contingent to arrive and explore the resources…gold was the main interest, as their planet needed monoatomic gold to repair the giant holes in their atmosphere.
After first cities of civilization were being established, the Earth outpost was visited by World Emperor ANU.
ALALU and ANU got into a wrestling match. ANU was kicking the shit out of ALALU and it seemed he was going to lose. Then ALALU saw his chance!
ALALU grabbed a hold of ANU's penis with his mouth, ripped his cock off, and swallowed it.
ANUNAKI penis apparently is extremely poisonous, so ALALU and the ANUNAKI knew that he was going to die a horribly painful death in the next coming months.
So, instead of executing ALALU, they ended up banishing him from the planet Earth, and forced him to go to Mars to die.
ALALU's pilot that was allowed to stay with ALALU when he died,
When ALALU finally died, his pilot was told to create a tomb out of a mountain for ALALU, because he was still considered a King of NIBIRU.
So, ANZU the pilot, carved out a tomb inside a mountain, and then used his spaceship to carve ALALU's face, wearing the Eagle Helmet of the ANUNAKI.
That way, NIBIRU could see ALALU's face from their homeplanet.