The first one works best for me. I love the contrast between the blue/cold colours and the warm reflection. Really good.
I find the middle part of the last one very good too, just the blues and whites. I would have zoomed into that area more.
Ute
The first 2 are really nice. Compositions in area's like this are tough, there are often filled with busy area's, and I see that in the top of #1. I would crop the top 1/4 of the shot or so and get rid of as many bare branches as possible. In #2 I would crop the whole shot a bit, you have some ice poking in from the lower left and bottom, and things like that really take away from the flow of the shot.
Suggestions:
#1: experiment with crops... I agree about the top, but also the patch of white at the bottom right is a bit distracting. The color on the water in the larger pool is lovely, as is the S curve of the water flowing from the back left, through the pool, and out the lower left corner.
#2: The rocks in the left and bottom are too close to the edges... I suggest cropping them out, or if you have a chance, tighten the composition a little bit, and possibly also rotate the camera so that the stream itself leads into the frame at more of an angle toward one of the corners. I really like the soft swirl of water in the pool.
#3: There's a bit of clutter along the stream near the bottom (the twigs on the rocks that cut off the corner are the main distraction to my eyes), but you also have a nice sinuous leading line curving from the little cascade in the foreground and ending at the bend in the stream in the middle of the picture space, surrounded by the cliff face and the colorful tree. Very well done.
#4: I would suggest trying to remove, probably by cropping, the rocks along the edges of the pool, because they're too close to or lie on the edge, especially the bright white ones. The blue on the water makes it feel cold, like you'd expect a mountain stream to be, and I like the graceful lines of motion and reflections on the water.
Your exposures look like they're spot on, you've done a great job capturing the softness of flowing water, and the tranquility of the place. Now I'm having even more trouble waiting for the weekend when I can get back out and do some nature photography again
