Cool! How you make that gray/brown hill is basically this: 1. Paint the silhouette of the hill a medium grayish brown 2. Using a long, flat, stiff bristle brush take some regular brown and jab the hill in the areas where there are dark brown tree twigs, holding the brush upside down at a 45* angle the the backdrop It should make a scruffy "fan" shape. do this with half a dozen mixed shades of brown, yellow and gray until you have that stipply looking hillside. 3. Using a flat brush, add a rich medium green for the foregound trees, then using foam from an Athearn box cut into little triangles, add a lighter green over most of the tree, then finally yellow/green highlighting what would be the tops of the tree.