Howburn Digger, you sound really excited about your bird carvings at Brodick, and that's really cool.
But I can't really see what you mean, maybe I can see your heron but not really the raven or the curlew. You could post a photo that you've traced over where you see the figures?
MAybe some rock art types could comment on how they might have been carved / formed, I don't know if that's possible from a photo? I don't know nuffin about it.
I like your Andy Goldsworthy pine needles!