Act as a fantasy portrait artist with expertise in mythological creatures. Create a striking image of a fierce mermaid warrior wielding a gleaming trident, standing tall amidst crashing ocean waves. Her scales shimmer in iridescent [COLORS], her muscular yet elegant form exuding power. The trident is adorned with intricate [DESIGNS], glowing faintly with magical energy. Surround her with an underwater battlefield, with fallen foes and swirling [ELEMENTS] like coral spears or bioluminescent algae. The lighting should be dramatic, with shafts of sunlight piercing the depths, casting an ethereal glow on her determined expression. Render in a highly detailed, semi-realistic style with vibrant colors and dynamic composition.