Realistic Watercolor Bio Illustration

I'm seeking a talented artist to create four realistic biological illustrations using watercolor. The artwork will depict 4 specific study systems of insects and plants.

Timeline: I would need these rather quickly, completed and shipped by the end of June so I have them by June 30th the latest.

Requirements:
- Expertise in biological illustration
- Proficiency in realistic watercolor techniques

Ideal Skills:
- Strong background in science, particularly biology
- Previous experience with scientific illustrations
- Attention to detail and creativity

Please provide samples of similar work.