Realistic Large-Scale Portrait Painting

I'm looking for a skilled oil painter to create a large (over 24x36 inches) realistic portrait of a person. The painting will be displayed in an office setting.

Requirements:
- Expertise in realism oil painting
- Experience with large canvas sizes
- Ability to capture lifelike details and expressions

Ideal Skills:
- Professional background in fine arts
- Portfolio showcasing similar work
- Strong attention to detail and color accuracy

Please provide samples of previous work and estimated completion time.