well I think you need to give ur best to get a good result. 
Demoreels never lies. I know you can't do like these (maybe) but if u practice it u will benefit.

If no1 knows about why the trees are dispappearing well it's because of the wind. I removed the wind from the a. editor and voila! gd render no flickering....just the water surface has flicker cuz of the moutain reflection on the water. 
I'll try to tweak the reflections...Is there any tip abou this one?