“未寄出的信”咖啡馆插画

创作一幅时尚的 3:4 竖构图动漫时尚插画，采用富有表现力的水墨水彩风格，场景设定在窗边的一张小咖啡桌旁。画面展示了一位名为 {argument name="character name" default="Saiyu"} 的年轻女性，以四分之三侧面视角就座，她戴着宽檐黑帽，留着凌乱的 {argument name="hair color" default="灰棕色短发"}，身穿黑色露肩吊带裙，佩戴黑色颈圈和圆形黑色耳环，涂着亮面黑色指甲油。她的脸部被一个位于中心的大型不透明正方形遮挡块刻意遮住，遮挡块呈现温暖的灰褐色到棕色渐变，隐藏了大部分面部特征，仅露出部分眼睛、头发、帽子、耳朵和肩膀。她的右手伸向桌上的黑色密封信封；信封上有一个圆形的黄色柠檬片封蜡。旁边放着 1 杯高透明玻璃杯装的深色冰饮，杯中插着 1 根黑色吸管，杯沿装饰有 1 片黄色柠檬轮，杯身印有 1 个黄色圆形标志。使用奶油色、黑色、炭灰色、柔和棕色以及明亮的柠檬黄作为点缀的有限色调。构图上，左侧前景设有一个极具戏剧性的黑色斜向窗框，窗外是模糊的黄色花朵和叶片，白色桌面上投射着粗犷的干笔触阴影，并带有写意的水墨边框。整体氛围应如同捕捉到的决定性瞬间，概念标题为 {argument name="scene title" default="Letter Left Unsent"}：私密、时尚、苦涩且具有电影感。在右下角添加一行细微的、类似水印的签名文本 {argument name="signature text" default="SAIYU。"}。保持插画的写意感和绘画感，呈现可见的笔触纹理、高对比度的黑色形状以及柔和的奶油色背景，除签名外，画面中不应包含其他额外角色或可读文字。

Create a stylish vertical 3:4 anime fashion illustration in expressive ink-and-watercolor style, set at a small cafe table by a window. Show a young woman named {argument name="character name" default="Saiyu"} seated in three-quarter view, wearing a wide black hat, short tousled {argument name="hair color" default="ash-brown hair"}, a black off-shoulder camisole dress with thin straps, a black choker, round black earrings, and glossy black nail polish. Her face is intentionally covered by one large centered opaque square censor block in a warm taupe-to-brown gradient, hiding most facial features while leaving part of one eye, hair, hat, ear, and shoulder visible. Her right hand reaches toward a black sealed envelope on the table; the envelope has exactly 1 round yellow lemon-slice wax seal. Beside it is exactly 1 tall clear glass of dark iced drink with exactly 1 black straw, exactly 1 yellow lemon wheel garnish on the rim, and exactly 1 yellow circular emblem printed on the glass. Use a limited palette of cream, black, charcoal, muted brown, and bright lemon yellow accents. Compose the scene with a dramatic diagonal black window frame on the left foreground, blurred yellow flowers and leaves outside the window, a white tabletop with rough dry-brush shadows, and sketchy black ink borders. The mood should feel like a captured decisive moment, titled conceptually {argument name="scene title" default="Letter Left Unsent"}: intimate, fashionable, bittersweet, and cinematic. Add a small subtle watermark-like signature text {argument name="signature text" default="SAIYU。"} in the bottom-right corner. Keep the illustration loose and painterly with visible brush texture, high contrast black shapes, soft cream background, and no extra characters or readable text beyond the signature.