a migratory-bird post carrier delivering addressless letters along a monsoon route: dives on rising air toward an unnamed rooftop and passes a blank letter through an open window

The subject is a migratory-bird post carrier delivering addressless letters along a monsoon route, located in estuary rooftops before the monsoon arrives, performing this action: dives on rising air toward an unnamed rooftop and passes a blank letter through an open window. The deliverable is a feature illustration for a nature-education workshop. Frame the scene with a square centered composition broken by one action direction, with no decorative symbols crowded around the subject and deliver it in 1:1. Lighting and color: tidal blue gray, sea-salt white, reed gold, and one rescue orange accent; light and dark emerge from layers and negative space in the chosen handmade medium, without plastic gloss or photographic flare. The medium is gouache, wax crayon, and torn handmade paper with visible brush marks and fibers, with precise control of paper fiber, hand-torn edges, layered shadow, and negative-space relationships. Materials touching the action must follow this rule: retain handmade marks at subject edges and keep the contact point clear, without unrelated decoration. Action reading order: Keep the full action “dives on rising air toward an unnamed rooftop and passes a blank letter through an open window” in one continuous plane, with its contact point and result both visible. Inside “estuary rooftops before the monsoon arrives,” emphasize only “a migratory-bird post carrier delivering addressless letters” and the connected actions “dives on rising air toward an unnamed rooftop and” and “dives on rising air toward an unnamed rooftop and”. Handle text only as follows: place no text, numerals, brands, signatures, or watermarks anywhere. Necessary exclusions: Characters must be original; avoid stiff anatomy, floating objects, oversaturated neon, and AI watermarks. Final art direction: original handmade mixed-media illustration with matte mineral pigments and visible paper fibers. Use this controlled palette as the dominant visual system: #D8C18E, #657A52, #6D6A63, #E6A07A; preserve believable local material colors within it. Keep any text absent or minimal unless the source brief explicitly requires it; never add logos, signatures, or watermarks. Keep one unmistakable primary subject or information route and one readable visual action. Use disciplined negative space and avoid default perfect symmetry. Physical credibility is mandatory: correct gravity, contact shadows, material thickness, tool weight, joint loading, fabric tension, liquid direction, reflections, scale, and occlusion. Create an original visual with no resemblance to a public figure, copyrighted character, existing campaign, or living artist signature style. No unrelated decorative icons, floating objects, duplicated limbs, plastic gloss, waxy skin, synthetic collage artifacts, or AI watermarks. Return exactly one finished image composed for 1:1; no variants, process sheet, split panels, mockup frame, or contact sheet.

画面中心事件：沿季风路线投递无地址信件的候鸟邮差在季风抵达前的河口屋顶群借上升气流俯冲到无名屋顶，把一封空白信递进开窗。成片用途：自然教育工作坊主题插画。构图按方形中心构图被一条动作方向打破，主体周围不堆装饰符号执行，成片比例 1:1。色光方案采用潮汐灰蓝、海盐白、芦苇金和一点救生橙；亮暗由所选手工媒介的叠层和留白形成，不使用塑料高光或摄影光斑。采用水粉、蜡笔与撕边手工纸混合，刷痕和纸纤维真实可见；纸纤维、手撕边缘、叠层阴影和留白关系必须清楚可信。动作相关材质：主体边缘保留手工媒介痕迹，动作接触处清楚，不增加无关装饰。画面只展开这一动作：动作分层：前景清楚呈现「借上升气流俯冲到无名屋顶」，中景以「把一封空白信递进开窗」交代结果，两层之间不插入其他事件。「季风抵达前的河口屋顶群」中只突出「沿季风路线投递无地址信件」和动作「借上升气流俯冲到无名屋顶」「把一封空白信递进开窗」。文字规则：画面完全无字，不出现数字、品牌、签名或水印。同时角色必须原创，避免僵硬肢体、漂浮物件、过饱和霓虹和 AI 水印。