Though the resolution of this image is pretty small, you can still find out the reason we have posted this in our illusion list. In the mountains far ahead, you can clearly see a shape that can be referred to as a skull. The hollow eyes are even creepy adding a whole new impression to the illusion. The third hole below the one we referred as eyes can be taken as the nose. This is absolutely impressive as from a distance this far, it do appears like a skull crafted on the mountains.