Natural Arm Retouching

I need a skilled photo editor to retouch a lady's arm in a photo. The goal is to make the arm look smoother and more defined.

Requirements:
- Remove and sharpen the part of the arm that is a bit saggy.
- Edits should look very natural, not overly enhanced.
The ladies husband pictured recently passed away and I would just like the photo to look really nice for her and not worry about what she looks like.
Ideal Skills:
- Proficiency in photo editing software (e.g., Photoshop).
- Experience with skin retouching and enhancing muscle definition.
- Strong attention to detail to ensure a natural look.