Prompt: Octane render. Rococo style portrait of Marie Antoinette as a cake with delicate ornate frosting. Detailed face, delicate face, detailed large eyes. Beautiful patterns and colors. Chinoiserie wallpaper. Mix of realism and fantasy.

Rococo style. John Williams Waterhouse, Fragonard, Thomas Gainsborough.

Perfect composition, sharp focus, smooth, rule of thirds, golden ratio. 
Negative prompt: Two heads.