Thanks. Actually the snow is proving to be a pain because light colours don't yield so well to dodge and burn. Here's the current iteration:

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I've got a few floating rock issues and the cliffs need quite a lot of work. A task for tomorrow now. This is proving to be harder work that I thought - but that's what I get for messing with this style. Learning some useful things though. I'll be very grateful for any C&C on this.