I think a thin rubbed on tint would be ok.although i.ve only done this once on a grizzle bear who's hands were on the sides of a door jam and his head on top of the door frame,which I still have. Thinned down water base paint is what I used back then as suggested by the pattern designer.
whoa! A light water color wash on the backing board with grain so nice in green or blue would be a big plus for this gem.perfect match wood and fish!!!