Realistic Black and White Sketch

I need a talented artist to create a realistic black and white sketch of a picture of my friend. The sketch will be part of my art collection.

Requirements:
- The final artwork should be in black and white.
- The sketch should be done in a realistic style.

Ideal Skills:
- Proficiency in realistic sketching
- Experience with black and white artwork
- Attention to detail and accuracy

Please provide samples of previous work.