Great landscapes caught in superb lighting. #1, 2 and 3 are fabulous. I love how in #1 the dark ominous hills behind give the foreground hills a real presence not felt in #2 and 3. Any chance of there being just a bit more sky at the top of #1 (looks tightly cropped). As well, the foreground shallow slope leading to he hills could be darkened to balance the dark hills above.
Perhaps because it is put in the same lot as the 3 dramatic photographs preceding it, but #4 seems underwhelming, although not without potential. The curvaceous nature of the hills behind the trees seems to be lost due to their relative brightness and lack of "shaping" contrast.
That's the way I see things. Great stuff!