There's a common misunderstanding about snow. I hate to break the news to you, but it's not white. It has a lot of different colors, ranging from yellowish to light shades of purple, depending on the circumstances, but not white.
|Snowy Polder, oil on panel, 7.1 x 11.8"|
|Snowy Dune, oil on panel, 27.6 x 39.4"|
Snow landscapes often hinge on the contrast between warm and cold colors. A few warm accents in a predominantly cold painting often make a big difference. In the Snowy Dune painting the bottom part of the sky and the dune grass (detail below) do the trick. If you want to be sure of the warm-cold contrast you could try painting your snow landscape on a mars red ground. You'll be surprised!
|Snowy Dune, detail|