Seamless Realistic Portrait Face Swap

I have a single portrait photo that needs a meticulous face swap: my face must be blended so naturally that it looks like it was always there. The lighting, colour tone, texture and shadows all need to... (Budget: £20 - £250 GBP, Jobs: AI Image Editing, Graphic Design, Illustrator, Image Processing, Image Recognition, Photo Editing, Photo Retouching, Photoshop)