提示词A vertical portrait of an original adult astronomer, wearing a deep indigo jacket, positioned on a stone rooftop overlooking a twilight city. The sky is dominated by luminous, swirling clouds in hues of lavender and rose gold. The lighting is dramatic, emanating softly from within the clouds. The palette is rich, contrasting deep blues with vibrant pinks and oranges. Medium is delicate, hand-painted digital illustration. The composition is centered, focusing on the figure's profile against the celestial backdrop. Vertical 9:16 wallpaper; main subject in the lower-middle, quiet upper quarter for a lock-screen clock. Full-bleed artwork, no border, no frame, no text, no typography, no logos, no signature, no watermark.
