I paint mermaids on dock and marker posts...not rocks!
I went to Boston once and was so jazzed about the collections and types of maritime posts used in the everyday.
My mermaids on a post series features sea sirens who who are atop these features And never rocks... though I may paint a mermaid sitting on a barstool with a margarita on the rocks!!!
See mermaids for sle at rhondak.Art