I'l try tonight if I have time, the reason I high-lighted all snow regions the same is partly due to the fact that the amount of snow varies dramatically year on year so I seected a year with particulary heavy snow fall to identify all regions that have potential to require a snow camo, but also to give the whole image a "cold" aethstetic I thought that adding a secondary colour from the pallet may make it more difficult to see the differences but I'll give it a try.