Watercolorists

found: AAT, Oct, 5, 2015:watercolorists (watercolorists (preferred), water-colorists, water-colourists, watercolor painters, watercolour painters, watercolourists; artists who specialize in painting watercolors, which are works of art, generally on a paper support, to which pigment suspended in water is applied with a brush)

found: Merriam Webster online, Oct. 5, 2015watercolorist (one who paints in watercolors)