Nebula Watercolor over Renaissance Florence

A luminous nebula painted in soft watercolor washes rises above a Renaissance-era Florence cityscape at night. The nebula swirls in blues, purples, pinks, and touches of gold, with bright star clusters like twinkling pinpoints. The city below features terracotta roofs, pale limestone palazzos, slim arches, a grand cathedral dome, and the Arno river with stone bridges. Rendered with wet-on-wet watercolor technique: translucent layers, edge bleed, grainy paper texture, and delicate brushstrokes. The composition uses chiaroscuro and sfumato to fuse sky and city into a single, harmonious fresco-like scene. The scene should feel timeless and dreamy, as if a cosmic tableau were painted into a Renaissance altar piece.