Unified Hand-Drawn Book Diagrams

I need a designer to create diagrams for my book that have a unified design feeling. The style should be hand-drawn, and the color scheme should be black and white. The primary type of diagrams required are concept maps.

Key Requirements:
- Create hand-drawn style diagrams.
- Use a black and white color scheme.
- Focus on concept maps for the book.

Ideal Skills and Experience:
- Experience in creating hand-drawn illustrations.
- Ability to design cohesive and unified diagram styles.
- Proficiency in developing concept maps.