Packaging Design Proposal Board Prompt

Please generate a "hand-drawn packaging proposal board style" product introduction poster for {argument name="product name" default="milk powder"}.

If I provide a product image, please use it as the main reference, retaining the core visual characteristics, packaging form, colors, materials, brand identity, and overall temperament of the product. Prioritize the main color tone and color relationships from the product image for the design.
If I do not provide a product image, please automatically generate a product appearance and packaging design that fits the positioning of {argument name="product name" default="milk powder"}, and automatically match natural and reasonable main, auxiliary, and background colors based on the product attributes, category characteristics, and temperament.

Overall poster style requirements:
This is not a standard e-commerce detail page or a simple studio-shot poster, but a creative proposal board that integrates "product finished image + packaging design sketches + brand concept development process." The overall presentation is a high-aesthetic, high-completion brand design display image, as if a designer is presenting a packaging concept proposal.

Visual requirements:
- Vertical composition
- Use a unified background with a brand feel; the background color should be naturally determined by the product itself and not fixed to any one color.
- Color schemes should coordinate with product attributes: if there is a reference image, prioritize inheriting its main and brand colors; if not, automatically generate a reasonable color scheme based on the product name.
- Place the most complete and eye-catching product main visual in the center, with realistic textures, 3D lighting, and commercial finish effects.
- Surround the product with multiple auxiliary visual elements: packaging sketches from different angles, structural sketches, local form explorations, hand-held display drafts, packaging unfolding ideas, and brand lettering layout experiments.
- Add natural and casual black or dark hand-drawn line art, arrows, circles, symbols, and handwritten Chinese annotations to give the image a strong sense of "design process" and "creative proposal."
- The finished product image should be relatively refined and realistic, while the sketch parts should be relatively casual and dynamic, creating a contrast between the "finished product + design sketches."
- The layout should look relaxed and free, but overall it must have order, rhythm, and a visual center, reflecting a high-end graphic design feel.
- Small graphics, symbols, or interesting elements related to the product can be added appropriately to enhance brand memory points.
- The final effect should have a sense of branding, creativity, process, and visual impact.

Color principles:
- Do not fix a yellow background.
- Automatically select the main color tone based on product type, material, use, consumer experience, and brand temperament.
- The background color, product color, text color, and sketch line art color should coordinate with each other.
- High-saturation monochromatic backgrounds or soft, unified color schemes can be used, as long as the overall image has a brand feel and visual impact.
- Colors should naturally serve the product rather than overshadow it.

Style keywords:
Packaging design proposal board, brand concept development, hand-drawn sketches, design process feel, moodboard, creative review draft, product finished rendering, visual experimentation, commercial design poster.

Special notes:
- If there is a reference product image, prioritize following it and do not deviate from the product itself.
- If there is no reference image, automatically generate reasonable product appearance, packaging, and color schemes based on the product name, maintaining overall style consistency.
- The focus of the image is "product introduction + creative design process display."
- Do not make it look like a common e-commerce detail page, a promotional poster, or overly neat and stiff; do not lack sketches and handwritten annotations; avoid a cheap feel or an immature cartoon style.

请为【{argument name="产品名称" default="奶粉"}】生成一张“手绘包装提案板风格”的产品介绍海报。 

如果我提供了产品图片，请以该图片为主要参考，保留产品的核心外观特征、包装形态、颜色、材质、品牌识别和整体气质，并优先沿用产品图中的主色调与配色关系进行设计。
如果我没有提供产品图片，请根据【{argument name="产品名称" default="奶粉"}】自动生成符合该产品定位的产品外观与包装设计，并根据产品属性、品类特征和气质，自动搭配自然合理的主色、辅助色和背景色。

海报整体风格要求：
这不是普通电商详情页，也不是单纯棚拍海报，而是一张融合“产品成品图 + 包装设计草图 + 品牌概念开发过程”的创意提案板。整体呈现为高审美、高完成度的品牌设计展示图，像设计师正在展示一个包装概念方案。

画面要求：
- 竖版构图
- 使用统一且有品牌感的主色调背景，背景颜色根据产品本身自然决定，不固定为某一种颜色
- 配色应与产品属性协调：如果有参考图，优先继承参考图的主色和品牌色；如果没有参考图，则根据产品名称自动生成合理的色彩方案
- 画面中央放置一个最完整、最吸睛的产品主视觉，具有真实质感、立体光影和商业成品效果
- 产品周围加入多个辅助视觉元素：不同角度的包装草图、结构草图、局部造型探索、手持展示小稿、包装展开思路、品牌字样排版试验
- 加入自然随性的黑色或深色手绘线稿、箭头、圈画、符号、手写中文批注，让画面具有强烈“设计过程感”和“创意提案感”
- 成品图要相对精致真实，草图部分要相对随性灵动，形成“完成品 + 设计草图”的对比
- 版式看起来松弛自由，但整体要有秩序、有节奏、有视觉中心，体现高级平面设计感
- 可以适度加入与产品相关的小图形、小符号或趣味元素，增强品牌记忆点
- 最终效果应具有品牌感、创意感、过程感和视觉冲击力

配色原则：
- 不要固定黄色背景
- 要根据产品类型、材质、用途、消费感受和品牌气质自动选择主色调
- 背景色、产品色、文字色、草图线稿色应彼此协调
- 可以使用高饱和单色背景，也可以使用柔和统一色系背景，只要整体有品牌感和视觉冲击力
- 色彩应自然服务于产品，而不是喧宾夺主

风格关键词：
包装设计提案板、品牌概念开发、手绘草图、设计过程感、moodboard、创意评审稿、产品成品渲染、视觉实验、商业设计海报

请特别注意：
- 如果有参考产品图，优先遵循参考图，不要偏离产品本身
- 如果没有参考图，则根据产品名称自动生成合理的产品外观、包装和配色方案，并保持整体风格统一
- 画面重点是“产品介绍 + 创意设计过程展示”
- 不要做成普通电商详情页，不要做成促销海报，不要过度整齐呆板，不要缺少草图和手写批注，不要廉价感，不要低幼卡通感