[Bigh4u2]

If you look closely, you can see the 'alien' is part of the rock.

[Eepsy]

He looks like he snuck out of his underground habitat for a smoke and has just checked his watch to find he’s five minutes late for hydroponics duty.

[Axenolith]

It’s probably a cast created when molten sand ejected from a local atomic blast coated a Martian human that hadn’t reached the shelters, or the Earth bound evacuation ships, in time...