Step 23

Create a Hue/Saturation adjustment layer and bring the Saturation values down to -60:

Make a Color Balance adjustment layer to give the mountains some green. 

Add a Curves adjustment layer to decrease the visibility of the mountains.

Step 24

Open the mountain 2 image and place it in the right of the foreground. Add a mask to this layer to remove background, leaving the mountains and the plant around it visible only.

Step 25

Make a new layer and use a small soft brush with the color #606b5c to paint on the front of the mountain to reduce the light on it. Change this layer mode to Multiply 25%. 

Create a new layer and use a soft brush with the color #d2ccab to paint on the shadow areas of the mountain. Alter the layer mode to Soft Light 30% and use a layer mask to reduce the effect on some details.

Step 26

Add a new layer, change the mode to Overlay 100% and fill with 50% gray. Use the Dodge and Burn Tool to refine the light and shadow on the mountain.

Step 27

Make a Hue/Saturation adjustment layer and bring the Yellows values up to +12:

Create a Color Balance Balance and alter the Midtones settings:

Add a Curves adjustment layer to increase the contrast of the mountain and the environment around it.

Make a Brightness/Contrast adjustment layer and bring the Brightness values to +35. On this layer mask, paint on some bright details of the mountain to reduce the light there.

Step 28

Open the landscape 4 image and use the Lasso Tool to select the midground and foreground to add to the left of the main document. Convert this layer to a Smart Object.

Add a mask to this layer to remove the hard edges to blend it with the existing ground.

Step 29

Go to Filter > Sharpen > Unsharp Mask and fill in the following settings to make this part sharper.

Step 30

Create a new layer (set as Clipping Mask), change the mode to Overlay 100% and fill with 50% gray. Use the Dodge and Burn Tool to paint more details, light and shadow for this part.

Step 31

Duplicate this layer and move it to the right of the foreground. Flip it horizontally (Edit > Transform > Flip Horizontal) and use a layer mask to blend it with the foreground besides the mountains 2.