The purpose was to work with the white backing of the snow against her dark skin. I have been looking at Man Ray today and I wanted to work with some harsh lighting and some dark shadows. Here's a sneak peek at what the project yielded. It wasn't a total success, because I kept sinking into the snow and my subject and I were both freezing.
I shot with a Nikon D5000, using an detached Canon flash circa 1981. It was about 13 degrees outside. We lived to tell the tale.