Realistic Pencil or Charcoal Head Sketch

I need a skilled artist specializing in realistic style sketches, particularly pencil and charcoal. This project is for personal use, so it would be great if the artist could incorporate a unique touch.

Ideal Skills:
- Proficiency in creating realistic sketches
- Expertise in using charcoal as a medium
- Creativity for personalizing the piece.

Experience:
- Prior work of a similar nature
- Portfolio showcasing realistic charcoal sketches.

I'm looking for something similar to the attachments.