Realistic Face Swap & Backgrounds

I have several images that need a believable face-swap as well as a full background replacement. All the faces come from photos I will supply, so the job is to blend each new face naturally—matching skin... (Budget: $30 - $250 AUD, Jobs: Adobe Photoshop, Background Removal, Graphic Design, Image Analysis, Image Processing, Photo Editing, Photoshop, Photoshop Design)