One of the main difficulties during winter photography is to capture the snow. It deceives the exposure cell of the camera: the scene is perceived as overexposed and the sensors tend to make the whites more gray. You need to compensate for the exposure by overexposing by one or two f-stops or by lowering the shutter speed. Do not hesitate to refer to the histogram to evaluate the correct exposure of your image.
On sunny days, snow can also appear blue due to the reflection of the sky. This can give a certain aesthetic to your photograph. However, if you prefer to tone it down, adjust the white balance manually.