Thanks all for the comments, and Jack for the advice. I've been working on the shadows throughout, and tried to change the shadow depth in the front room as advised. Just discovered the Blur tool, which has made touchups much easier! I think I'm happy with the snow as well. Well, maybe it needs some purple... (And some blending into the rooms - thanks Jack!)

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So does a low-end tablet make this a lot easier, or is that a personal preference sort of thing?