Photographing objects in the snow has a lot of challenges, some of which you cannot prepare for ahead of time. After all, winter weather rarely proves predictable.
Brilliant white snow confuses your camera, leading to underexposed shots and snow that looks gray in the final image. Help your camera in one of these three ways.
Frame your shot, then focus. Then zoom in to a bright area of snow in the scene. Using your exposure compensation button, dial in a value between +2/3 to +1 2/3 EV, depending on the brightness of the snow. Take a meter reading, remember the settings, switch to manual, and dial in the new shutter speed and aperture. This overexposure will ensure that the snow looks white, but it won’t blow out other objects in the photo.