This piece was made for RenderMan's Timeless Art Challenge. Completed in Maya, various detail sculpts from ZBrush, shading from Substance and Photoshop, snow was a mix between Maya particles and displacement, rendered with RenderMan, composited in Nuke. The fog was a combination of a volume primitive, and billowy fog using Maya fluids.

https://renderman.pixar.com/news/renderman-timeless-art-challenge-final-results
Model by Kitbash3D & Speedtree - RenderMan “Timeless” Art Challenge