Fiery haired sea goddess in a glowing underwater realm

Hyper-detailed fantasy digital painting of a mermaid-like sea goddess with voluminous fiery orange curls, underwater scene in blue-green hues, sunbeams filtering through water, bubbles rising around her, ancient submerged castle towers in the distance, pale porcelain skin with iridescent scales along shoulders, ornate seashell jewelry, hair streaming gracefully, serene yet intense expression, warm glow on her face contrasting with cool water, painterly brushstrokes, cinematic lighting, high detail, ultra-high resolution.