This made me rush off to my archive. Some years ago I was on Eigg, an island in the Inner Hebrides off the west coast of Scotland. At the back of a beach there is a narrow gap less than 6 feet (2m) wide going back in the cliff face. There is a waterfall at the back. It is quite spooky. On looking at my image later, there are faces, a big one on the right, and one on the left in front of the water. With a bit of imagination, there may be others. Long ago, when superstition was prevalent among some remote communities, such sights could well have been the source of tales of elves, goblins, trolls and spirits.
Best wishes,
Jonathan