My own critique would be as follows:
1) A home run. Truly stunning. Primordial. I echo the sense of timelessness (beginning/end/awe) that the others have attributed to this image. I keep wanting to look at it again and again.
2) Rather nice at first blush, but is too blurred toward the far-end of the image and doesn't really captivate my interest for long, as with the first one. I looked for a payoff but never really found it.
3) Ditto. I don't get to see color. I don't get to see the whole tree. And although I understand it is supposed to make me feel "dreamy" ... I kept wanting to "step back" and see something interesting in the fog ... but I never got to see anything truly captivating ... so I went away a bit unsatisfied here also.
4) I like this one. Not quite as riveting as the first, but I did get a sense of satisfaction looking at it. As EduPerez said, I "felt the mood" in this one ...
That's my honest $0.02,