step 1: open both images; background and the image that will be placed in front. drag the photo of the person with the move tool to the tab of the background image, with out letting go place it on top of the background.

 step 2: select cut and refine the person/ image. this gets rid of the extra spots of the original background. using adjustments layers and masks.

step 3: use the blemish tool and the history brush to take care of extra spots

step 4: colour adjustments to blend image to the background and make sure the colours are well balanced.