In progress, on the easel, is this snow challenge. The snow was fresh when I took the photo references. Fresh light power snow reflects light on the surface and into the subsurfaces. The shadows reflect the sky color, blue in this case. In cloudy days the shadows are grayer, there is more sun than dark clouds here. Overall, the snow picks up the colors that surround it. I went with a warm red underpainting for contrast and bits of that peak through here and there.