Big Cy ~
The photo has a mat finish, but I'm pretty sure it's not water based paint. Too thick and heavy. Plus, I'm almost embarressed to suggest the following, but since we're taking long shots here, I suppose it couldn't hurt. As soon as I saw your photo painting of the RIV, I immediately thought of "RIVERS"
So try this name ... [ But more specifically the father, Joseph Edward Rivers ]
Andrews Rivers, photographer, former business owner, author.
SOUTH BERWICK, Maine - Andrew L. Rivers, 81, of 36 Wadleigh Lane died Monday Dec. 31, 2001, at his home. Born in Coaticook, Quebec, Canada, on April 4, 1920, the son of Joseph Edward and Albertine (Moreau) Lariviere. The family moved to Dover, N.H. in 1930, where his father, a professional photographer, established a studio, and it was there that young Andrew’s photography career began.