How to : 

Picture-ception.

take image number 1, and highlight the part you wish to remove.

once you have selected it, then layer via cut.

move onto image number 2, and take the layer you wish to implant from image number 1.

 then line up the image and adjust the image to fit into the space you need.

then add a layer mask once you are happy with the placement of the image you have moved over.

once you have the layer mask in place, paint out the parts you dont need.

use the eraser tool to make some final touch ups, make the image look nicer.

And VOILA.