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First off, I love the idea of autumn snowfall, especially with the low sun intensifying the gorgeous foliage plus giving a nice contrast with the trees framing the right side. The lighting also does a beautiful job bringing out Twilight Sparkle's form and beauty. Also, the detail on the nearby tree is terrific.
Now, I know that you wouldn't have left her tail in rough form without a reason, but I can't figure out is she's supposed to be ethereally emerging from the rock or something like that. (I'll just blame the wind for now. )
Thanks for sharing.