一个复古茶包（主图风格）

A single vintage tea bag lying on a clean white background, hand-painted with an intricate illustration resembling a book cover. The tea bag has delicate aged paper texture, soft warm lighting, and realistic details. On the painted design, leave a clear blank space labeled [BOOK] for the book title. Cinematic, high-resolution, vertical format 9:16.。建议：尝试把背景换成品牌主色，做成 campaign-ready 营销素材。