Step 11

Add a Curves adjustment layer to increase the lightness and reduce the contrast.

Step 12

Place the landscape 3 image over the canvas and set this layer on top of the layers. Add a mask to this layer to remove most of this image, leaving the pond, mountains and some parts of the ground on the right visible only.

Step 13

Make a new layer (set as Clipping Mask)  and use the Clone Tool to remove the power lines on top of some mountains in the middle.

Step 14

Create a new layer and use a soft brush with the color #9d9f98 with the opacity about 30% to paint on the mountains in the middle. Change this layer mode to Overlay 100%.

Step 15

Make a Color Balance adjustment layer to bring some yellow to the landscape 3 part.

Step 16

Add a Selective Color adjustment layer and alter the Whites settings to make the water become blue.

Make another Selective Color adjustment layer to add more saturation to the water. On this layer mask, paint on the parts besides the mountains so they won't be affected by this adjustment layer.

Step 17

Create a Curves adjustment layer and increase the contrast. On the layer mask, paint on some areas of the middle to reduce the effect there.

Make a Brightness/Contrast adjustment layer to increase the light and the haziness on the right of the foreground. The selected areas show where to paint on the layer mask. 

Step 18

Create a new layer, change the mode to Overlay 100% and fill with 50% gray. Use the Dodge and Burn Tool  to paint more shadow and light of the mountains.

Step 19

Open the sky image and drag it onto the sky part. Add a mask to this layer to remove the hard edges to blend the sky with the existing one.

Step 20

Make a Curves adjustment layer and increase the light. On the layer mask, use a soft black brush with the opacity about 50% to reduce the light on the edges and the middle.

Step 21

Create a Hue Saturation adjustment layer to change the color of the sky.

Make a Color Balance adjustment layer and alter the Midtones settings:

Step 22

Open the mountain 1 image and use the Rectangular Marquee Tool (M) to select the mountains and bushes part to add to the left side of the canvas. Add a mask to this layer to remove the hard edges and make the mountains visible behind the existing ones.