Digital Photography Tip Number 2....Overexpose snow
Tip #2) Overexpose Snow/White Scenes.... If you have a scene with mostly white like snow, set the camera's Exposure Compensation to overexpose the photo by +2/3 to +2 or more if necessary. Also new cameras have build in photo settings, where you can pick "Snow Scene" and the camera will overexpose for you.
This overexposure is necessary because a camera's light meter views neutral gray as the perfect exposure, so it will try and expose a scene to get the overall photo to equal neutral gray. So when you have bright white, the camera will expose the scene to make the white, gray, by underexposing the photo. You will probably have to experiment with the overexposure setting, depending on how bright the light is outside, like a sunny day compared to a cloudy day.