Photo Enhancement - Adding a Person

I'm looking for a skilled photo editor to seamlessly add a person (or two) into a scenic background photo. The added individual should appear natural and well-blended into the environment. The photo I am wanting is of my partner and his late father in front of a cabin they built together. My partner has no photos of them together at the cabin. I have multiple photos of the cabin, my partner, and my late father-in-law. I have attache dphotos of the cabin in question.

Key Requirements:
- Expert-level photo editing skills
- Ability to blend subjects into backgrounds convincingly
- Attention to detail