"Would advice you reduce the scene to the basics like removing landscape elements like grasses, trees and stuff, and render only the building. When ok with results, then turn on all the bells and whistle. In this scene I love the grass, is it…"
"Increase the cloudiness and the sunlight... I usually use .5 for clouds and 2.0 for the sun for a typical exterior residential model. This will brighten and soften the shadows considerably. Also raise your ambient light to high with a setting…"