Yes, I agree Scott, Digarts (Gardon Hose) has two CD's that provide great hoses for doing this kind of work, I have both. One is for leaves, trees, grasses and shadows (Jungle3D) and the other allows you to draw in your own trees, branches and trunks (Tree Forestry), work very well with a tablet and I recommend them both. I've used them sparingly. The only concern with them is that you need to be in careful control of lighting and shadow placement since they're not 3D objects. Nozzles in Painter are a lot like tubes in Photo Paint except they have more randomness to them. You can also create your own nozzles.