To try and explain my thoughts on the images......
I understand what you're asking, and I think first and foremost, the subject matter is particularly appealing to me. I lived in the Alps for near enough a decade, and have a huge appreciation for mountain landscapes. I think the second image is composed well, with the river leading in from the bottom left, the fringing of rugged peaks in the top left, and the larger mountain sitting on the top right third. I think that the light spill onto the rocks bottom right enhances the image well, and the atmospheric perspective throughout the scene appeals hugely to my interest.
I've seen many images shot over mountains from a plane, and a combination of the subject matter and the composition, along with a relatively good control over the exposure, has led to a pleasing shot in my eye.
With reference to number 4, viewing a scene like that in real life would blow my mind. If I had taken that shot, I would probably B/W it, and put it straight on a wall. Mainly because I haven't seen any mountain scene which shows the scale and beauty of a range like that, plus the glacier adds great context and places the image. I can't explain the extent of my passion for the mountains, and as such, I consider these two, well executed shots of some of the worlds finest peaks. I guess it is a combination of these things that led me to post my earlier comments