Opulent Art Nouveau architecture, sinuous lines, organic forms, flowing curves, jewel-toned colors, emerald green, sapphire blue, amethyst purple, golden yellow, rich bronze, ornate metalwork, stained glass windows, intricate mosaics, natural stone facades, florid patterns, botanical motifs, whimsical illustrations, warm soft lighting, dramatic shadows, high contrast ratios, 2.5D composition, vibrant textures, realistic reflections, ambient occlusion.