Group (Ctrl+G) both of these peaks layers along with all their adjustment layers together and name it as “Peaks 1”.

Step 13

Then create a new layer (Shift+Ctrl+N), in clipping mask above the Peaks group layer. Name this layer Shadow/Lighting. We will add some contrast to the peaks by adding some shadow and lighting using dodge and burn tool (O).

Set this layer to overlay filled with neutral color, 50% grey.

Now activate the Burn tool and with the Range set to Midtones and Exposure set to around 15%, darken the lower parts of the peaks.
Then picking the Dodge tool with the range set to Midtones and Exposure of about 15%, paint some highlights where the light source is more profound.

Here is the layer set in Normal blend mode:

And here is the result in Overlay blending mode – 100% opacity:

Remember that all these layers should be place under the Landscape 1 layer.

Step 14

Now open the second peak stock and choose Quick Selection Tool (W) to make selection of the peak stock selected in red.

Next, add the peak to the main stock. With Free Transform Tool, scale it's size as needed. Then add a layer mask to it and using a soft brush of low opacity (23-25%), mask away the section of the peak shown in the selection below:

Step 15

To brighten some parts of the peak I used a Curves layer with Clipping Mask:

Fill it's layer mask with black (Cmd/Ctrl+Backspace) and then using a soft brush -100% opacity and with the foreground colour set to white, reveal back the effects from the parts indicated in the selection below:

Create another Curves adjustment layer in clipping mask, to darken the parts selected below:

I wanted to brighten those parts which I had done earlier even more, so create a Curves adjustment layer once again to brighten the areas indicated by the selection:

Step 16

Open the peak stock once again and select the part shown in red using a Quick Selection Tool (W). Import it to your main document and using a Free Transform Tool, scale its size if needed and rotate it slightly at an anti-clockwise direction.

Add layer mask to it and using a soft brush of medium opacity mask away the parts as shown in red colour: