Cloning

 'cloning tool' 

 after

 before

'history brush tool'

When cloning a image you simply click the clone samp tool then go over the image you want to make double, then simple brush on the other image on another part of the page, wherever you wish the other image to be, then you have two images, then you have to select the history brush tool and that is just like an erase tool but it brings up the image from before, you use this to rub out the outside of the image to make it neater.