This Kelpie idea is based on a book that I read. It was about Big Foot and also Sea Monsters. There were a lot of eyewitnesses who reported that the sea monsters they had seen, looked like black horses with long ears, necks and tails etc. which sounded more like a form of Kelpie.
Ah, pity, I wanted to participate in "deviant critique" with this, but my subscription has terminated. Critique welcome, nonetheless. ^^
A painting process GIF can be seen here [link]