from The Century Dictionary.
- noun The quality of being painty, or overcharged with paint: said of a picture.
Sorry, no etymologies found.
I love looking at the old guy's profile--your paintiness gives him a sense of motion, too.
The Big Blue and Fire-Fire- Fire! william wray 2008
A great wave of repugnance swept over her, engulfed her, as her eyes traveled over the rows of small wooden houses with their stiff, uncomfortable porches, their treeless yards, and their flaunting paintiness.
The Gold Girl 1921