Watercolor Techniques for Realistic Snowy Trees & Bushes
Print out a good quality photograph of snow-covered trees. Steve uses a picture taken in February of Yosemite National Park, which you can find here.
Start by studying a single pine tree and the shape its branches and the snow on top make, and lightly sketch in simple outlines with your pencil. Try to draw without preconceptions on what the tree or snow should look like, and remember that nature is always random and unpredictable, so your tree should end up looking quite uneven. You can also sketch in the trunk and the snow on the ground. Clean up any extraneous lines with a kneaded eraser, especially in snowy areas, before continuing.