Create a highly detailed vertical 9:16 fine-art fantasy portrait of an adult woman and her supernatural warrior-mask counterpart, designed as a perfectly symmetrical split-face composition. The composition is divided vertically down the exact center. On the left side, portray an elegant adult East Asian-inspired woman in close-up, showing half of her face and upper body. She has refined natural facial features, luminous realistic skin, a soft blue-gray eye, delicate eyebrows, naturally shaped lips, subtle makeup, and a calm yet mysterious expression. Her long black hair is styled into an elaborate traditional updo with sweeping sections of glossy hair, decorated with intricate red, ivory, and gold floral ornaments, dangling tassels, beads, and antique jewelry. On the right side, transform the corresponding half of her face into a powerful mythical oni-inspired warrior mask, seamlessly aligned with the woman's facial structure. The mask features an intense golden-red eye, a long curved ivory horn, layered carved ivory surfaces, sharp fangs, ornamental red and deep-navy details, gold filigree, and elaborate traditional fantasy decorations. The transformation should feel like two identities occupying the same face rather than two separate characters. Surround the entire portrait with an intricate Japanese-inspired fantasy ornamental environment: dramatic curling ocean waves, stylized white foam, red peonies, delicate cream blossoms, scattered petals, flowing ribbons, traditional decorative motifs, clouds, and abstract swirling patterns. Integrate the woman's hair, mask, flowers, waves, and background into one cohesive composition. Use a sophisticated hand-painted mixed-media illustration aesthetic, combining extremely fine ink linework, delicate watercolor washes, textured gouache, subtle oil-paint layering, visible brush strokes, aged-paper texture, intricate ornamental detailing, and controlled painterly imperfections. Use a rich palette of deep navy blue, crimson red, warm ivory, muted beige, charcoal black, and antique gold. The woman's realistic facial skin should contrast beautifully with the highly detailed mythical mask while maintaining consistent lighting and anatomy. Emphasize realistic individual hair strands, natural eyelashes, detailed jewelry, fabric texture, carved mask surfaces, floral petals, wave patterns, and tiny decorative elements. Composition: centered symmetrical portrait, vertical split exactly through the face, close-up to upper-body framing, balanced visual weight, intricate full-frame artwork, strong depth and layering, elegant negative space around facial features. Lighting: soft diffused illumination on the human side, dramatic directional highlights on the mask, subtle warm reflections on gold ornaments, atmospheric shadows, cinematic depth. Overall mood: mysterious, elegant, powerful, mythical, timeless, sophisticated, dramatic, and visually immersive. Create an original fantasy artwork, not a replica of any existing artwork or character. Negative prompt: extra eyes, extra faces, duplicated features, asymmetrical split, extra horns, multiple horns, extra arms, extra fingers, malformed hands, distorted anatomy, deformed face, blurry details, plastic skin, photorealistic mask, modern clothing, logo, text, watermark, signature, frame, low resolution. Aspect ratio: 9:16 Quality: ultra-detailed, high resolution, intricate fine-art illustration Style strength: high