Epic Underwater Kingdom Illustration

I'm seeking a skilled digital illustrator to create a captivating book cover for a fantasy adventure novel. The illustration should depict an epic and adventurous underwater kingdom setting.

Key Requirements:
- An underwater kingdom backdrop
- A mood that conveys epic adventure
- Inclusion of heroic characters, legendary creatures, and ancient ruins
- A looming shadow of a menacing presence

Ideal Skills and Experience:
- Expertise in digital illustration
- Experience with fantasy-themed artwork
- Ability to create dynamic and engaging compositions
- Strong use of color and lighting to set a mood

Please include a portfolio with relevant work.