score_9, score_8_up, score_7_up, 1girl, solo, dual-tone hair, black and green hair, shoulder-length straight hair, blunt bangs, hair tucked behind ear, yellow eyes, black eyeshadow, black eyeliner, subtle blush, perfect eyes, defined eyebrows, natural lip color, jewelry, forehead embellishment, mermaid-like scales, gentle smile, charming head tilt, cheerful expression, enchanting underwater fantasy theme, direct gaze, engaging viewer, striking fantasy sea floor, vibrant, high resolution, cinematic style, intricately detailed, realistic elements discouraged, idealistic beauty emphasized, captivating underwater ambiance.