The following Southeast Asian Ramayana paintings were photographed by Margery H. Freeman and displayed on the learnnc.org site (no affiliation with this blog).
Click thumbnails to view images on Learn NC.
Modern Balinese painting of Ravana's mermaid daughter with dark skin.
Thai mural depiction of the same mermaid character in an earlier scene in the epic.
Another Thai Ramayana mural painting featuring a merman, a mermaid and what appears to be a nagini. (female naga)