Regarding how the scence was lit, I used an HDRI image available at CGskies, its free for download (see Image). Then I inserted a corona SUN with an intensity of 0.04 (see image). Gamma is set at 2.2 and I posted the render settings.
The scence was modeled in AutoCAD Architecture using the link option.
I used a grass clump and used corona scatter to distribute the grass plane, texture material is uploaded in the image. Tree material attached.
