Images: Is that a rock or a man on Mars?

Zooming in on the "face" resolves the mystery. The ESA describes it as a "remnant massif thought to have formed via landslides and an early form of debris apron formation. The massif is characterized by a western wall that has moved downslope as a coherent mass."

Photo by ESA/DLR/FU Berlin (G. Neukum), MOC Malin Space Science Systems