A grey card can be smart to have when shooting in snow if your camera has the option of setting the aperture and shutter time manually. What the camera tries to do is adjust the picture to match this standard grey color (don't remember what it's called) overall, which can be seen in your picture where all the snow is dominating the picture and adjusted to be a little bit darker. On the other hand, I think the picture looks great as it is.
You see, in this world there's two kinds of people, my friend: Those with loaded guns and those who dig. You dig.
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