FIRST, adjust the color of the picture by pressing CTRL M, the curves window appears, and then find AUTO and click it. to make a selection,set the radius:9,

use pen tool to select parts to be duplicated,

after all parts are selected, right click and select make selection.

after making a selection, press CTRL C,

make another clipboard, press CTRL N. after making another clipboard, press CTRL V to paste the selection, adjust the color of the image by pressing CTRL M, switch the channel to RED(same with green). adjust the curves to darken/lighten the color of the picture. after this, use pen tool to select parts to be duplicated,

after all parts are selected, right click and select make selection.

after making a selection, press CTRL C, and paste it to the last picture you had made a selection, continue until photo has been arranged/or customized properly.