Hey Ryan, I just now saw this and it looks really good. I especially like the modeled branches and the canopy texture. I would suggest more of a taper on the top of the trees so they don't end so abruptly. Also make some grass for the foreground to help blend the terrain and ferns. Once you get some fog\ haze in here I think it will really start taking shape. 

Also check out this guys work. He has some great twigs and lower level detail that I think you could add in. http://www.polycount.com...d.php?t=72008&page=3