use a dry brush
Sometimes use a brush that’s absolutely dry and free of paint, to fade and soften shapes. If your painting is small enough, you can rest it on a plywood panel and dry it in a pre-heated kitchen oven at 200˚F (or 95˚C) for two hours.
13 A apply retouch varnish
Retouch varnish is simply damar varnish diluted with turpentine. It glosses up the painting, deepening the blacks and rendering every brushstroke visible. I apply it with a 2in hake brush, taking care to pick out the inevitable hair fragments with tweezers before the varnish becomes sticky.
11 Wind down with secondary characters
While savouring figures that turned out well, now is a good time to attend to completeness. I paint that extra buffalo and make sure there’s meat and structure inside the shadows. I add some extra variegation to the tundra surface.
12 Savour, contemplate, double-check An important stage, I take maybe 20 minutes to just let my eyes roam over the piece, making sure everything is as I want it. If not, now is the time to go back in and make corrections.