I have to disagree! For me, stage 4 is the best one. It has this duality which I like a lot, between the green vegetation and the beige rocky structures; fertile vs barren; life vs death. It's like an ancient city taken over by wild vegetation as nature claims it back!

In stage 2, it's just the single feeling of cold/winter, there is no complexity. In the final one, the whirlwind is distracting and simplifies the color palette.