Hi, this is my first successfull image made with LSystem.
It took me one weekend, the time making LSystem run and learning to make nice trees with it included.
Very nice picture, the grass kills it for me though… The rocks are very well done though overall the picture could use some more “action”.
WeWa
Cool image. The lighting could be improved. Maybe some more sunshine. And the foreground lacks details. And maybe some more variation in color of the plants.
Or maybe don’t change anything with the lighting and add fog. Whoooo. That could look great… 
in a jungle, i would add some dark place under the tree and put some ray of volumetric light (not so bright) just to see some more lighted spot on the ground(i would give your image an atmosphere as this will give illusion of (deep in the wood).
And trun the green of the grass a bit darker, it just don’t fit in a jungle…
-and a color map to the rock just to mimic some dirt.
that it, keep improving!
I like it! 
One thing I’d like to crit on: The grass looks artificial because the ends are squared. You used the Fiber script, right? Try setting it to “pointed” in the fiber properties.
The modeling and texturing (bumpmapping) of the stones is really awesome!
every vegetation rendering I see in Blender brings me joy & hapyness 
I’m not too worried about the grass. that’s obvious but the rock texture needs a little more work
It looks like someone has just gone to the trouble of washing the rocks they need to be dirtied up a bit and not so reflective