> What I always find difficult to emulate is the light combined with the 
> texture/transparency of the leaves. I have your technique about the 
> leaves (faked translucency mapping) and also use double_illuminate. It 
> is the atmospheric media which is often difficult to do. Isotropy is 
> fairly straightforward, but I often prefer the use of Henyey-Greenstein 
> scattering withou too extreme eccentricity.
> 

Instead of double_illuminate, you should us the back side illumination. 
Starting with version 3.7, it's done by using two values after diffuse. 
It gives you much more control.
Example : diffuse 0.6 0.3
Just remember that the two values should add to less than 1.

If you use double_illuminate with a diffuse value of 0.6, what you 
effectively get is this : diffuse 0.6 0.6
This is not realistic at all.

You can also add some filter to the pigment. Keep that pretty low.

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