My dear... You know, the sun is quite behind the cliffs, and the cliffs are bending forewords towards the camera, making a sort of natural cave sort of thing, do you really think that in a cave like this one that the shadow would be only visible on the ground? Ever stood on the outside looking into a cave? And the reason it is not all shadowed, is that firstly it would look damn ugly, and secondly because there are small cracks in the ceiling of the cave, letting the light seath through it.