@ JyonnyNovice, Hey Jyonny, thanks, Yeah I use some gouache and watercolor and if I want to make a painting totally opaque or paint over something a bit then I add some chalk and mix it into the watercolors only a tiny bit to give it some body, the chalk is just white chalk powder, calcium carbonate, nothing more. if you have a hard cover sketchbook you can get some clamps on the edges to tighten up the page your painting. Hope this is helpful.
life study
life study