Matte Painting.

Look at the picture before reading this. Done? Alright, I added all of the snow elements. This photo was of a house in the fall months (or at least on a cloudy day). Overcast days are essential to selling a painting when you're trying to add snow and ice. The same thing goes for pushing the black levels of your image. Additionally I could have held back on so many icecicles. I'm most happy with the snow on the bushes and the snow that blew up through the screens covering the windows (which leaves that kind of sand blasted fringe above the sill).