As for your weathering and your venue, I think you are right on in choosing the winter scene and moving the location into the forest rather than the bocage. You could easily get away with not white-washing but instead just making your M8 extra dirty and muddy with rain streaks and so on. One of my favorite photos of the little guy is this one which I have seen in a number of sources on US armor. You can see from the photo that it is well "lived in" by the crew and has taken on a pretty fair amount of mud, dirt and grime. I think it's a pretty good inspiration for what you are wanting to do.
Keep up the good work here!
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