The second ruin looks flat now. We will add some shading behind the ruin. Create a new layer (Shift+Ctrl+N) behind the second ruin layer. On this new layer, paint dark shading behind the ruin as indicated in red arrows in the screenshot.
Proceed to add another object to the scene. We will add stairs. Open the tower with stairs image first, the next steps we do are the similar steps as the ones in previous steps. Cut out the tower. Scale and place the tower in front of the first crack.
Give this tower layer a layer mask. Mask unneeded part.
Duplicate the tower layer some times. Place the duplicates where needed.
On this step, we will alter the shape of the first ruin. To do this, duplicate (Ctrl+J) the first ruin. Scale its size bit bigger than the first one. Place this duplicate layer in front of the first crack layer.
Give this duplicate layer a layer mask. Mask parts where needed as shown in the red highlight.
Next we will alter the shape of the third crack. Select the layer, and give it a layer mask. Mask parts as the ones highlighted in red.
By repeating the previous step, add the other object on left top of the rock.
By repeating similar steps with trial and error efforts, this is the result that is finally done for our inspiration. This piece will be used as the main object in the main canvas in the next steps. We still have a long, long way to go….. a cup of coffee, please :)
Now we will create the main document. Create a new document/canvas (Ctrl+N).
Firstly we will create background for image. To do this, open the misty sea image on the new document. Take rectangular marquee tool (M) in the tool panel. Make selection on the upper part of the image. Duplicate (Ctrl+J) the selection to make it a new single layer in the document.
We will use this new layer to create misty texture for the background of the image. Take free transform tool (Ctrl+T). With this tool, click-hold and drag the upper middle transforming point upward and the lower middle one downward to cover the white background.
Duplicate the layer and set the duplicate to multiply blending at 100% opacity.
Next, place the original misty sea image above the two misty layers in the layer panel.
Mask the upper part of this layer to hide it. We just use the water texture of the image.
Select all the background layers and hit Ctrl+G to group them in a folder. Name this folder BG
Open the rock image stock. Cut out the rock of the image.
Add the cut out to the main document. We will use this cut out as the base of the rocky mountain with ruins created before.
Mask the pirate house layer on the lower part to make it well blended with the rock behind it.
Cut out again some part of the rock image. Add the cut out to cover the lower left part of the pirate house.
Mask the cut out to make it well blended with the pirate house. Finally select all the pirate house layers and hit Ctrl+G to group them. Name this group, say pirate house.
Proceed to add cloud texture to the background. Open the BG folder and add the cloud image within the folder. Scale the size of the image to the size as needed and place in the position where the brightest cloud in behind the lower right side of the pirate house.