Realistic Adult Coloring Book & Journal Design

I'm looking for a talented illustrator to create a realistic-themed adult coloring book and journal.

Requirements:
- Realistic illustrations
- Adult-targeted content
- Nature and famous city landscapes themes

Ideal Skills:
- Strong illustration skills, especially in realistic art
- Experience designing for adult coloring books
- Creativity in nature and cityscape themes
- Proficiency in digital design tools

Please provide a portfolio showcasing relevant work.