Realistic Preschool Character Design

I'm seeking a talented illustrator to design two realistic children characters for a preschool book.

The characters should embody the following traits:
- Playful and energetic
- Innocent and curious
- Adventurous and brave

Ideal Skills & Experience:
- Expertise in realistic illustration
- Experience with preschool age character design
- Creativity in portraying diverse characteristics

Please provide a portfolio showcasing relevant work.