I'm not the best judge on whether the snow looks completely accurate but it is more than good enough for me. Some quick test renders I did mainly to see how to light it for a good result.

Top: Angelina Snowlie (I know, I was a bit drunk at the time and thought it was funny). BB's envirosphere with an equirectangular image I found as texture. IDL + 1 infinite light. Snow mat applied to V4.
The hair looks rubbish because if it was snow it would be solid not thin like that.

Right: Snow mat applied to Toon Penguin. BB's envirosphere again, this time with a gradient applied as the texture. IDL + 1 infinite light. This time I moved the light further back. so that the snow wasn't made too bright.

Bottom Left: Exactly the same setup as the Penguin but with 3DU's Pocket Pets Kitty plonked on the snow, without snow shaders applied to him. Because I just got him today.

Checked out the link you suggested but couldn't find any free ones that would do. Will probably look for some that have a similar stance and work from there.

Daz Studio 4.8 and 4.9beta, Blender 2.78, Sketchup, Poser Pro 2014 Game Dev SR5 on Windows 8 Pro x64. Poser Display Units are inches