Hi! Thanks everybody for the comments!
Niuanse, Sure, trees are mainly from CG Axis (http://cgaxis.com/product/cgaxis-models-volume-5/) and Evermotion (Just 1, I don't remember exaclty which one, let me check it), leaves are not two sided, it just have reflection. In this scene we use aproximately 20 different proxys.
Vennisnavagho, do you refer to the tres's leaves? Are just BRDF, with Diffuse, reflection almost white and Opacity map.
Thanks a lot Frank! Yes, all our portfolio it's made on SketchUp, well, there are two images that don't but we ware just testing 3DS Max.