Coatlicue
So this one is Aztec, not Mayan, but a very interesting (and creepy) statue. Coatlicue, known as a "primordial earth goddess," gave birth to the moon and stars, as well as the Aztec war-god Huitzilopochtli, who burst from her womb fully grown and armed for battle to fight his enemies. She is also known as a "snake woman" and referred to as "our grandmother."
The particular statue in question is a terrifying visage. Her head is formed by two snakes, facing each other. She wears a necklace made up of human hands, heads, and skulls. She also wears a skirt of snakes. Check out this quote from our friendly neighborhood Wikipedia:
"Most Aztec artistic representations of this goddess emphasize her deadly side, because Earth, as well as loving mother, is the insatiable monster that consumes everything that lives. She represents the devouring mother, in whom both the womb and the grave exist."
Bottom line the goddess Coatlicue is no joke. In fact the statue of her that was recently found in Mexico City, and now resides in the museum, was originally discovered in the 1700s and scared the crap out of the Europeans, but the natives started to worship it. The statue was deemed so demonic and terrifying, it was immediately reburied and "lost" for a few more centuries until the modern era where it was re-excavated. In real life the statue is 8 feet tall!