Vertical 2:3 clean commercial nature background, created from scratch. A fresh tropical meadow beneath a vast pale-blue sky, framed by palm fronds entering from both side edges. Dense soft green grass, flowering shrubs and a shallow calm stream across the bottom. Leave a broad clear central sky. Absolutely no watermark, no logo, no brand, no characters, no Chinese, no letters, no numbers, no glyphs, no signature, no text-like marks in any corner or edge.