Whimsical Art Nouveau building, sinuous lines, flowing curves, organic forms, luxurious materials, ornate decorations, soft pastel hues, muted earth tones, rich jewel tones, iridescent sheens, stained glass windows, intricate mosaics, natural motifs, floral patterns, botanical illustrations, vintage posters, elegant typography, warm golden lighting, shallow depth of field, 2/3 composition, symmetrical framing, ornate architectural details, realistic textures, ambient occlusion.