Added to the wiki. We don't have much on PBR yet, but here it is. http://wiki.polycount.net/CategoryRendering#Physically_Based_Rendering_.28PBR.29 Good texture Josh.
Day 29: Audrey Hepburn Final Part - Added Eyebrows and lashes, fighting with sculpting and baking - managed to get a halfway decent rendering out of it.
Diamond, Cactus - this isnt shaderforge, but... check it out, very similar http://stevencraeynest.wordpress.com/2013/03/29/easy-volumetric-explosion-in-unity3d/ http://vimeo.com/61959085
Check your Projection Cage and padding. You also might want to have a look at this http://wiki.polycount.com/NormalMap?highlight=%28%5CbCategoryTexturing%5Cb%29#Sloped_Extrusions
http://wiki.polycount.com/CategoryEnvironmentFoliage?highlight=%28%5CbCategoryEnvironment%5Cb%29#Foliage_Tutorials You can find very useful infos/tuts about everything on the Polycount Wiki .
Your tree would benefit greatly from Vertex Normal. Check out this wiki page http://oldwiki.polycount.com/VertexNormal?highlight=%28\bCategoryEnvironmentFoliage\b%29
If it was that easy everyone would do it... but seriously - the polycount wiki is pretty good for all aspects of 3D http://wiki.polycount.com/CategoryCharacterTexturing?highlight=%28%5CbCategoryCharacter%5Cb%29