In the illustration above, you can see that this block in is more than simply slopping on the paint in shapes vaguely resembling the trees and bushes. Instead, what you see are a variety of strokes. In the foreground, the yellowish tree has a shadowed area with medium green stroked on vertically. Same with the top, less shady area in lighter yellow-green. Next to that is a tree with three different tonal areas. This is ready for the first layer of strokes resembling leaves but by no means the last. In the bottom area, a medium green will be laid on in shapes resembling boughs. In the next level up, a lighter green will be used, and a still lighter, more yellow green for the top. This process is repeated for each tree.