Christina, here is a perfect situation for a Singh Ray three-stop split ND grad filter. You could retain detail in the snow and detail in the dark forground at the same time by expanding the overall tonal range to make this a powerful image. In fact, with a sky darker by three stops it appears you would have had a stunning sunset full of color as well. As a vertical image it would have worked well as a cover for a magazine because you've allowed enough space at the top for a title.
