Simpicity is often the key to outdoor lighting, IMO. Use one overhead infinite light for the sun. Set the intensity to around 50% and whack the shadow map up to 1024. Use 4 or so infinite lights at around 20%, scattered around the "equator" for fill in lighting. If you need to add more, remember to turn down the intensity of all your lights unless you want an over exposed look. Use white lights and turn off the shadows on everything but the "sun". I've never rendered a cloudy day scene so I couldn't really tell you how to do that one. At a guess, I'd say to make the shadow intensity lower and more washed out and generally darken all the lights, maybe adding a little yellow in there.

Coppula eam se non posit acceptera jocularum.

My Store

My Gallery