Soon is now
Great scene, I love that sky, really wintry.
What I mostly use for snow is a derivate of a tgc I once found in this forum (can't remember who made, it but might well be Dandel0), which basically uses a default shader with some PF inputs for color variation, luminosity, displacement, reflection and translucency, and a min slope addition for old deep blue ice.
I often add a surface shader with a reflection shader and tiny, sparse fake stone as child, masked by another tiny sparse fake stone shader, masked by distance shader, to get some pinpricks of reflection within 20m or so. And I often add a dirt surface layer, with a percentage of coverage and some dirty color.
You have to remember to attach the 2 distance shaders inside to the render camera.
