You are off to a good start but everything looks too clean and even. Nature is random and organic. I would try a little more angle variation in the leaves and more color variation in the diffuse. 3 or 4 earth tones would make it pop.
Also try this post for some EPIC info on foliage: http://www.polycount.com/forum/showthread.php?t=126456
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Also try this post for some EPIC info on foliage:
http://www.polycount.com/forum/showthread.php?t=126456