...

Here's another.

Here's a render from yafray. Modeled with SKECTCHUP. The model was
exported into blender with the use of this script.

(shaxam.com)

The quality of the render is low, because my computer is old.

I did other renderings with a different engine. Named Yaf(A)ray.

http://www.yafray.org/forum/viewtopic.php?t=976&postdays=0&postorder=asc&start=270

and here.

http://www.yafray.org/forum/viewtopic.php?t=976&postdays=0&postorder=asc&start=315

You can get a few trees here.

(www.kerkythea.net)