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The background
Create a plane and place in the position as in the image give it a map with a self illumination at 100, give it an uvw map and adjust the position...

 

The Light
For the illumination I used 4 omni light you can look at the image for the setting (the shadow colour must be dark blue, it’s importantfor the real snow look)make some experiment to find the right setting of the light.

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