Photo Editing: Combine Four (4) Individual Professional Photos into One (1) Professional Group Photo

I need a professional photo editor who can seamlessly integrate four (4) separate individual professional photos into one (1) professional group photo. The rate stated in this post is negotiable with full payment to be made once the project is completed and approved by the client. For bids, please include past works. Note that such works do not need to be a full-blown portfolio so long as they can demonstrate the contractor's ability to perform the task.

Ideal Skills:
- Proficiency in photo editing software (e.g., Adobe Photoshop etc.)
- Strong understanding of lighting and perspective
- Excellent attention to detail
- Prior experience with similar projects