The image above by Luke Oldale/countryboy is the alleged Fish Face of Lover’s Leap – see the Roslin Glen carvings site nearby for discussion.
However, I have posted an image of one of the Hawthornden cliff carvings which I believe to be the actual Fish carving.
It’s just a shame that it wasn’t a vesica piscis – that would have been cool because we could have said it was by the Chapel masons or the Templars. ;¬}