There is no photgrametry for this region, yet.
And satelite imagery is not the best either.
What you see in your screenshots is mostlikely because there were clouds when the satelite scanned this area.
In this case the sim is generating its own textures so you dont see just white clouds on the ground.
And yes, those defaylt textures are of very poor quality, like FSX.
There isnt much you can do, definitely no in-ge setting will help.
You either wait till there is new satelite imagery of that region from Bing or you search inline for a 3rd party mod that covers that region.