Create a Snowy Forest River Scene in Blender!

Discover multiple techniques to creating a realistic Snowy Forest River Scene in this Blender 2.7 Tutorial!
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Assets:
Snow 1: http://cgtextures.com/texview.php?id=42540&PHPSESSID=81i1a1hf7u432qqo6sc7kkuj64
Snow 2: http://cgtextures.com/texview.php?id=42533&PHPSESSID=81i1a1hf7u432qqo6sc7kkuj64
Snow 3: http://cgtextures.com/texview.php?id=30354&PHPSESSID=81i1a1hf7u432qqo6sc7kkuj64
Pine Branch: https://www.dropbox.com/s/hfvvqgiewxq9l1f/Spruce%20Branch.png
HDR Map: http://www.hdrlabs.com/sibl/archive.html (Its the Snow Machine one)
Finished Scene: https://www.dropbox.com/s/8mjda1muzc7uzx0/Snowy%20River%20tutorial.blend