Stamp

I have been looking at the stamp tool and effect on Photoshop.
 
I have first used the stamp effect to create these celebs in black and white, the effect picks out the details in black and leaves other parts white, it gives off almost a pop art effect.
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Second I have used the stamp tool or clone tool to create this six headed giraffe, by taking a section by pressing 'alt' you can then position the pen elsewhere and create the section again, I chose the giraffes neck and head.                                                   --------->