Envision a majestic sea goddess in a commanding pose, wielding a water trident

Envision a majestic sea goddess in a commanding pose, wielding a water trident. Her aqua blue hair flows ethereally around her. This full-body portrait captures her frontal view against the backdrop of an underwater kingdom. The scene is illuminated by dim, volumetric lighting, creating an atmospheric, cinematic effect. Render this epic composition as an 8K Octane masterpiece, with stunning, intricate details. The image should embody a fantastical concept with deep, complementary colors. Incorporate elements of a detailed matte painting to enhance the underwater realm's mystique. The overall aesthetic should be a harmonious blend of colorful fantasy and controlled color chaos, resulting in a visually striking and immersive portrayal of this powerful aquatic deity in her domain.