Here is the result.

Duplicate the hue/saturation layer and set the duplicate to multiply at 100% opacity. Select all the background layers and hit Ctrl+G to group them in one folder. I named this folder BG.

Step 17

Now select the middle rock layer and give it a layer mask. Mask areas on the bottom of the rock to make it look like being covered in the mist.

Step 18

Next, give this rock layer a hue/saturation layer with a clipping mask. Set the value of the hue/saturation as the one below:

Set the hue/saturation layer to soft light blending at 100% opacity. Here is the result.

Duplicate the hue/saturation layer two times. Make sure that the two duplicates still have clipping masks on it. Next set the two duplicate to normal blending at 100% opacity.

Step 19

Give the other new adjustment layers with a clipping mask to the middle rock. This time, we will give it brightness/contrast and photo filter with values shown below:

Set the two layers to normal at 100% opacity. Select all the middle rock layers and hit Ctrl+G to group them in one folder. I named this folder middle rock. Here is the result:

Step 20

In this step, we will add foreground rock to the scene. We will use an almost similar way on how we create the middle rock in the previous layers. Open the stock image, cut out the part needed, and add the cut out into the main document. Scale its size as needed.

Add another rock to the main document.

Mask the second cut out to make it well blended. Select all the foreground rock layers and merge them (Ctrl+E). I named this layer foreground rock.

Step 21

What we should do next is to fix the edges of the rock. It still has hard edges. Give this layer a layer mask. We will mask the edges of the rock. Take the brush tool and choose the 27 spatter brush in the brush picker.

Mask the edges by stroking the spatter brush with black color.

Step 22

We need to change the color of the foreground rock. To do this we will give it two adjustment layers with clipping masks. First give it hue/saturation.

Duplicate the hue/saturation layer two times. Set the original layer to soft light at 100% opacity and the two duplicates to normal at 100% opacity.

Finally, give it a photo filter layer with a clipping mask. Set this layer to normal at 1005 opacity. Select all the foreground rocks and group them in one folder. I named this folder foreground rock.

Here is the result.

Step 23

In this step we, we are still working on the foreground layer. We will give it some shadow. To do this purpose, create a new layer above the photo filter layer by hitting the short keys Shift+Ctrl+N on the keyboard. Make sure to give this new layer a clipping mask.

Take a very soft round brush set to 15-20% opacity. On this layer, stroke the brush on the selected areas with black to give it shadow.

Step 24

Create a new layer above the shadow layer with a clipping mask. Set blending option to soft light and check the Fill with Soft Light-neutral-color (50% gray) to fill the new layer with color of 50% gray.