Fleetwood, yes you are absolutely correct. But even with casting shadows in this scene I think the result would have been subtle and probably not worth the added render time.
Yossam, the new result looks great! Much better to my eye. Granted it's daytime now and not dusk, but I think if you could maintain this level of brightness/exposure but have a more sunset lighting, it would be great too. Just don't lose the brightness! Remember that in real life with a real camera you would increase exposure compensation as the light got darker for sunset, to maintain a "good" level of exposure of the scene, so just because your scene gets darker as you move the sun toward the horizon doesn't mean you need to keep it that way.

- Oshyan