Somehow occurred to me halfway through this i’ve been doing almost exclusively blue sketches lately. Don’t think it counts as polychromatic if there’s only one colour.
Also only somehow just occurred to me using very transparent brushes is almost like having pressure-sensitive brushes, in that i can go over an area multiple times and the places i really focus on quickly grow much darker than the areas i don’t. It’s not perfect, as it’s a little fuzzy and takes much longer, but it’s better than nothing. I am happy.