Opulent Art Nouveau apartment, flowing organic lines, sinuous curves, ornate metalwork, stained glass windows, intricate wooden paneling, velvet upholstery, lavish furnishings, grand chandelier, soft warm lighting, rich textiles, floral patterns, natural materials, earthy color palette, high ceilings, spacious rooms, elegant archways, ornamental mirrors, luxurious carpets, vintage decorative accents, 3/4 composition, shallow depth of field, realistic textures, ambient occlusion.