1. Draw in simple trees with pencil and fill in the trees with Maskoid:

2. After the Maskoid has dried a minute or two, wet your whole page with a sponge, quickly add watercolor (be sure to leave some lighter "misty" spaces), and before that has a chance to dry, add a generous amount of coarse salt:

3. Let that dry a little (time will depend on how wet the paper is). Then (this is the fun part) peel off the Maskoid:

4. Next, use brown watercolor on a dry brush or old gift card to make the tree-bark texture, and to make the trees more dimensional. Birch trees have horizontal dark marks in their pale bark:

