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And now use Quick Selection Tool (W) select the sky, inverse selection (Cmd/Ctrl + Shift + I) and adjust mountains contour in Refine Edge (Cmd/Ctrl + Opt/Alt + R). Set Radius: 3.0px and, of course, "Smart Radius". Use brush in this dialogue box to remove remaining sky in trees. And as always, add a layer mask :). And let me remind you that we are moving down through layers, so it will be lower layers.
As you can see in this image (I mean the mountain) is dominated by blue tint, and distant mountains in general as much shine, so I corrected it with adjustment layer "Curves" (Layer > New Adjustment layer > Curves...). As blue on a mountains a lot, so we need blue channel; on it make one point with Input: 163 and Output: 135. In the process I turn down the brightness a bit. On RGB channel make one point with: Input: 145 and Output: 106. Don't forget clip this adjustment layer.
Next, take a Brush Tool (B) (Size: 250px, Hardness: 0, Opacity: 50%,) set foreground color #111315, create a new layer (Cmd/Ctrl + Shift + N or use icon on Layer panel) and paint over too light mountains (they only). Make this layer as Clipping Mask (Cmd/Ctrl + Opt/Alt + G) and set Opacity: 25%. So much better. In this way we compensate a little bit of flare mountains and returned to their texture.
Now even small but important task. Hide all layers except duplicated mountain layer (eye icon next to the layer) and on layer mask, remove all except a small portion of the forest as in the image below. In Refine Edge set Radius: 1.7px (checkbox on Smart Radius), draw on the edges of forests. Place this layer above the layers with the mountain.
It is time to add the last mountain in our work. Repeat Step 23 for image "patagonian_landscape_07_by_fuguestock-d76299x" the only difference that you need Flip Horizontal (Edit > Transform > Flip Horizontal) this image and place it so that only hide valley of the previous mountains (this layer below them) and leave most of the mountains visible.
Again the same problem with the blue, but this time we will reduce the color quite a bit. Add adjustment layer "Curves" (Layer > New Adjustment layer > Curves...) wit there settings: Red - Input: 121, Output: 129; Green - Input: 158, Output: 154; Blue - Input: 114, Output: 102.