Many thanks for the feedback. I attach new versions. Please note that they really are new even if the changes are subtle.
#1: The darkness is meant to show a foggy day in a narrow valley, plus I wanted the cottongrass to shine. Now I have raised the brightness 5%. This shot has always frustrated me because the elements didn't align into a more balanced composition.
I did experiment with the greens. OTOH this is late summer so a bit of yellow is creeping in.
#2: As above, this is a dark place. I have now reduced the amount of applied darkening, and lightened the two outside rocks and the sky.
Halos: I hate halos, but I cannot find the source of these. I wonder if we are seeing light patches of sky??
#3: I was reluctant to cool it too much because the blues might seem unrealistic. Now I have compromised by cooling but also desaturating and darkening the blues.
No lightening was applied. I think the horizontal surfaces are just catching the sky's light. I pulled down the top end of the global curve, and added a darkening curve to the rocks in the water.
In "light" of darkness comments about the other images, I have now lightened this 5%.
Thanks again!