Experimenting with areas of light, using some heavy (300gsm) Bockingford watercolour paper. It needed to be that heavy because I worked it to death, with some areas turning to mud. After all that abuse, the paint still lifted from the paper (shadow side of the trunk).
The main object was to experiment with the relative brightness of different areas: to make something look light, make the areas around it darker. Leaves on the foreground tree were blotched with a bristle brush.