Opulent Art Nouveau mansion, flowing organic lines, sinuous curves, jewel-toned colors, velvet upholstery, intricate wood carvings, ornate metalwork, stained glass windows, grand chandeliers, plush area rugs, curved sofas, accent chairs, wooden paneling, floral patterns, natural materials, warm golden lighting, shallow depth of field, 1/2 composition, realistic textures, ambient occlusion.