Look deeply into shadows on snow. You will see beautiful blues and violets. Don’t be timid about adding these colors over snow. What a delight. Shadows on snow show the contours of snowdrifts. Pay attention to the way the angles change as the shadows move across the drifts. The shadows reveal the shape of the surface of the snow.
As you walk through a winter woodland, sketch those things that interest you the most. This may seem obvious but there is a tendency to take on much broader subjects than that which calls you. If you are interested in the shadows in the snow, draw the shadows in the snow, not the shadows, the trees, the distant mountains, and the clouds.
Click on the first image to start a step-by-step annotated slideshow on how to paint shadows in the snow with watercolor.