Photo Enhancement: Sitting to Standing Transformation

I need a professional photo editor to enhance my photo by transforming a person from sitting to standing. The photo should maintain a highly realistic appearance, so expertise in achieving a lifelike edit is crucial.

Specific Requirements:
- Change the person from sitting to standing while keeping the original background. The transition must be seamless and undetectable.
- Center all individuals in the photo with a little space on both sides.
- Modify the girl in pink's shirt so it appears to cover her belly.
- Change the photo's orientation from landscape to portrait.

Ideal Skills:
- Proficient in photo editing software
- Experience with realistic photo manipulation
- Attention to detail
- Ability to follow specific instructions