Watercolor Techniques for Realistic Snowy Trees & Bushes
With the size 8 brush and clean water, wet the underside and center of the bush, then drop in a mixture of the sky color mixed with Cobalt Blue and a touch of Alizarin Crimson for the snow in shadow. The result should be quite a light purple-blue. You can add some pure Cobalt Blue with the size 4 brush to intensify some of the shadows as well. Soften the edges of the shadows with clean water to create a rounded effect for the bush, and remember to leave the snow area white.