I think that’s sort of intentional in order to give the appearance of a cold, dreary landscape. However it can easily be changed to be more vibrant. Did you get Skyrim on Steam? If so, you can go on the Workshop and get Immersive Saturation Boost OR Immersive Contrast Boost to help get rid of that “washed-out look”. They aren’t compatible though so you’ll have to choose one. If you don’t have steam I think you should be able to still find mods on planetelderscrolls.com and tesnexus.com.
That’s one of the best parts of TES games: they have a great modding community, so if there’s something about the game you don’t like, there’s almost guaranteed to be a mod for it. Fixes, changes, improvements, additional content…all sorts of stuff. I usually just browse sorted by highest rating and install whatever looks cool, or if I want something specific I just put in the shortest description of what I want into the search, and I usually find something.
As for the ground flickering…that doesn’t sound right. Sounds like there’s either a problem with your installation or your hardware.
