Realistic Freshwater Fish Art for T-Shirts

I'm seeking a talented artist to create realistic, detailed designs of freshwater fish for the back of my t-shirts. These shirts are intended for sale, so the designs should be appealing and unique, yet true to the realism of the fish. I have an outline of the drawing that I have imagined attached. The style that I would like (Guy Harvey) like the images I attached.

Ideal Skills:
- Proficiency in creating realistic animal illustrations
- Understanding of design principles for apparel
- Experience in creating art for commercial sale

Please provide a portfolio of similar work, if available.