Expertly Add Person to JPEG Image

I'm looking for a professional photo editor to implement a realistic addition of a person from one JPEG image into the background of another JPEG image. It's crucial that the person added looks as natural and as originally part of the photo as possible. The location in the background where the person should be added will be specified.

Skills and Experience needed:
* Expertise in realistic photo editing
* Familiarity with JPEG image formats
* Ability to follow specific instructions for the placement of the person being added
* Proven track record of similar photo editing projects in a portfolio (or provide examples) is a plus