#1: I feel relaxed, and it made me feel sleepy, yet happy. I would change how blurry the sky and mountains are, it kind of hurts my eyes to look at them.
#2: I feel like I'm looking at a vintage photo. It's not relaxing to look at, it's too busy.
#3: I feel apathetic. Again, not relaxing, and my eye doesn't know where to look.
#4: This one definately has too much going on, for my taste.
When I compare them all I think "Let the picture speak for itself," which I feel like the first one does. I like that one the best because I felt the strongest (positive) emotion from it.
And the first one definately achieved the dream-like quality you intended for :]