I'm going to be a contrarian regarding the sky/salt issue. I've shot this location several times and the salt formations themselves are really the subject here. While with the right clouds you might be able to locate the division between the salt plain and the sky in various places, a composition something like this often works pretty well.
One of the hardest things about shooting this subject is that the supposedly white salt is generally illuminated mostly by the very blue sky - and the salt ends up being very, very blue. You have handled this in an interesting way. You really haven't suppressed the blue all that much but you have increased - or so it seems - the contrast between the dark areas and the raised ridges of salt. I think that works OK.
Regarding the "goes on forever" concept... I can understand that interest, but the other perspective, and one that makes sense to me having been there, is more of a "goes on for vast distances to the far mountains" is perhaps better shown by including the distant features. Removing them would turn this into something pretty unremarkable, unless you are a geologist... :-)
Take care,
Dan
(I've posted one of mine
here.)