If possible please elaborate which would be a help to beginners like me.

Now press CtrlJ to duplicate the layer in case you need to go back to the original image.In this layer you will use the patch tool to hide undesired parts of the image.

Press CtrlJ to duplicate the layer and then press CtrlU and in the option saturation put -70.

The the changes you made to the smart object press ctrl S and close the window.

Now go to folder you have the stocks and grab the image of the river.

You will see that the image is an smart object itself, you can change the size clicking in the corners.

Create a layer mask to erase the undesired parts of the image.

Pick a soft round brush to paint over the parts you want to remove.

Go to Create a new fill or adjustment layer and click in the option HueSaturation.

To Apply the changes only in the layer of the river you have to press right click over the Hue and Saturation layer and select the option Create Clipping Mask.

Now go back to the Background image and duplicate the layer pressing CtrlJ and then change the layer mode to soft light.

Grab the image of the city, and repeat the process of creating a new layer mask to blend the layer to the background.

Now pick a castle and resize it to fit the mountain like this.

Create a layer mask and like you did before hide with the brush tool the parts you dont want to use of the image.

Add a image of the waterfall and resize it to fit the mountain.

Use the layer mask technique once again to blend the waterfall.

Now add more elements to the image, can be mountains, castles, ruins, all of this to give to the image a better look.

Use the layer mask technique you learned in the steps before in each of the elements and remember to change layer mode to soft light or overlay.

In the previous step, your foreground color is probably black because you were painting with black.

Right-click on any one of the stroke and click on Stroke Path.

Select Brush from the menu and make sure Simulate Pressure is turned on.

If the highlights are too thickthin, undo the previous step, select the brush tool, and change the brush size hardness.

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