WOW!
Thanks for posting the full scale crop; amazing detail.
Yes I agree about the strong shape of the dark boulder, I just found that the dark area was pulling my eye away to the left. I usually leave my GI Relative detail at the default 2. I do like the way your surfacing/shapes are not overly "fussy" and on the whole like the strong contrast.
I don't think the grain in the haze is a real problem but even if you think it is that is relatively easy to fix.
I have never tried Linux not that I am overly impressed with Windows, only upgraded from 98 to XP so I could use TG2. XP Zarkes me off, all those little wizards and helpers that are always trying to second guess what I am trying to do. The second word is off!
If we could harness all the energy directed at hating Microsoft we could probably power the planet and do away with fossil fuels, nuclear power and off shore wind farms (There's an idea

).
I gave up on Tiff years ago, I used to work on a combined Unix, Windows 95/98 and Mac network and found that there were so many compatibility problems with Tiff that I just banned them. Oh how the Mac users loved me but nobody else wanted to do the data management.