Gigantic skull mountain rising above an ancient jungle river

A gigantic skull Mountain in the middle of a green verdant jungle. The open mouth of the huge skull travels into another realm of existance. There are ancient jungle villages built around the skull mountain. water is pouring out of the eyes of the skull and a big river is flowing away from the mountain. There are ancient bridges and roads headed to the mountain. The Skull appears to have been there long before any settlers have been there. Done in a high fantasy art style reminiscent of the masters of the genra.