Untitled (water and vegetation series) - watercolor 

and gouache on paper (Arches WC 140 pound hp) 

on 30 x 40 in. board--Sam Wethern, 2018.

Untitled (water and vegetation series) liquid acrylic on Arches 140# HP paper, 22 x 30 in., Sam Wethern, April-May 2018.

Untitled (trees and vegetation) - oil on paper, 22 x 30 in. arches 140 lb. hot press, by Sam Wethern April 2018

Untitled (water and vegetation series) - acrylic on paper (Arches 140# 22 x 30 in. HP)  - Sam Wethern - January 2018.

I've been trying out Golden "fluid acrylics".  They have great transparency and intense color mixing.  This painting (top) is on 22 x 30 inch Arches hot press 140# paper; below are two details.   Sam Wethern - January 20, 2018