Yeah thats looking nice. If I may suggest a few things. I think the snow is a little too smooth all over. It seems that when snow goes into a gradient it starts to break up and get little ridges over it. This looks like the sort of place where that would happen. Also I think lots of little icicles around the stream would be authentic too.
I was reading Ghalevs post too about how he uses these black and white versions and thats pretty similar to how I have been using stuff. What I do is blur B&W stuff up and then use the gray value to determine which and how much of each texture to apply - a lot like the map he posted. I think its a powerful technique.
Anyway, always enjoy looking at your maps. I find drawing snow scenes immensely hard work.