AI绘画提示词教程 - 如何用LLM精准反推图片风格并生成双足机器人

提示词模板：

A bipedal mech featuring a distinct, heavy, cube-shaped central torso. Two well-defined, humanoid-style articulated arms are mounted on the sides of the torso. It stands on reverse-jointed digitigrade legs connected to a separate hip assembly. Futuristic sci-fi concept art, intricate hard-surface detail, photorealistic 3D render, studio product shot, clean white background, soft studio lighting, utilitarian design, [your subject here], complex mechanical joints, matte and metallic textures, hyper-detailed, cinematic quality.

文生图模型： FLUX.1 Krea
语言模型： Gemini Pro 2.5

我最近网上看到一个很好看的双足机器人设计稿,感觉很好看,所以让gemini 帮我反推了一些提示词.

robots-design-template from dribble

一开始，我也只是简单地把图片扔给模型，让它“描述这张图”。结果往往不尽如人意：它可能会过度关注图片中的具体内容，而忽略整体的艺术风格；或者给出的描述是散文式的，根本无法直接用作提示词。

我意识到，想要得到可用的结果，必须先教会模型如何思考。于是，我设计了一个专门的指令，让它扮演专家角色，并按照一个结构化的框架来分析图片。这才是整个流程成功的第一步关键。

整个流程主要分3个步骤:

反推提示词获取:主动问如何根据图片反推提示词,让模型去设计问题
根据图片获取提示词**:根据第一步的结果.上传图片,生成真正的文生图提示词
迭代:根据模型返回的图片结果,逐步迭代,添加细节

3 steps prompt analysis workflow

反推提示词获取#

这一步是让大模型帮忙设计”如何让大模型反推提示词”

given a image, how to generate similar style of the image use image generation tools, i want to upload the image to an llm gpt, let it analyse the image, what type should it analyse, and how to organize the prompt to make the gpt output the image generation prompt

模型给出的建议:

You are an expert art analyst and a prompt engineer for AI image generators. I am uploading an image. Your task is to first analyze the image's style in detail and then generate a text-to-image prompt that can be used to create new images in a similar style.**

**1. Analyze the following aspects of the uploaded image:**
*   **Artistic Style:**
*   **Subject Matter and Composition:**
*   **Color Palette and Tone:**
*   **Lighting and Atmosphere:**
*   **Texture and Detail:**
*   **Medium and Technique (if applicable):**

**2. Based on your analysis, generate a detailed text-to-image prompt.** The prompt should be a single paragraph of descriptive keywords and phrases, separated by commas. Start with the main subject (you can provide a placeholder like `[your subject here]`) and then add the stylistic details. The final output should be a string of keywords ready to be used in an AI image generator.

**Example of a desired output format:**
`[your subject here], impressionistic oil painting, vibrant and warm color palette, soft and diffused natural lighting, visible and textured brushstrokes, serene and peaceful atmosphere, focused on capturing the play of light and color.`"

这样我就得到了一个提示词分析大师的模板。

初始提示词模板#

上传原图，以及上述的提示词分析师的模板，得到该图的初始提示词

A bipedal mech with a large boxy torso, powerful digitigrade legs, and smaller articulated arms, futuristic sci-fi concept art, intricate hard-surface detail, photorealistic 3D render, studio product shot, clean white background, soft studio lighting, utilitarian design, [your color scheme here], complex mechanical joints, matte and metallic textures, hyper-detailed, cinematic quality.

同时让它推荐了几个色系：

色系占位符 [your color scheme here] 样式推荐：

Vanguard Tech Style (先锋科技风格)
- monochromatic color scheme with glowing cyan emissive lights and bold orange accent decals
Military Style (军用规格风格)
- olive drab green and gunmetal gray with faded white stenciled typography and amber lights
Medical/Rescue Style (医疗救援风格)
- clean white and bright red plating with blue glowing cross symbols and warning labels
Industrial Style (重工业风格)
- weathered safety yellow and black hazard stripes with rusted metal textures and grimy details
Stealth Style (隐形特勤风格)
- matte black carbon fiber finish with deep red glowing optics and minimal gray markings

这一步获取的初始提示词在flux krea 上测试初见效果, 但是有些色系身体形状有些像异形,手臂也不完整,所以后面又迭代了几次

Vanguard Tech Style	Stealth Style	Military Tech Style

提示词迭代#

v2: constraint the body shape

A bipedal mech featuring a distinct, heavy, cube-shaped central torso. Two well-defined, humanoid-style articulated arms are mounted on the sides of the torso. It stands on powerful, reverse-jointed digitigrade legs connected to a separate hip assembly. Futuristic sci-fi concept art, intricate hard-surface detail, photorealistic 3D render, studio product shot, clean white background, soft studio lighting, utilitarian design, [your color scheme here], complex mechanical joints, matte and metallic textures, hyper-detailed, cinematic quality.

v3: add arm detail

A bipedal mech with a massive, perfectly cube-shaped central torso. It features two well-defined, humanoid-style articulated arms with distinct shoulders, elbows, and functional hands or grippers, mounted on the sides of the torso. The mech stands on powerful, reverse-jointed digitigrade legs connected to a separate hip assembly. Futuristic sci-fi concept art, intricate hard-surface detail, photorealistic 3D render, studio product shot, clean white background, soft studio lighting, utilitarian design, [your color scheme here], complex mechanical joints, forged carbon fiber and matte metal textures, hyper-detailed, cinematic quality.

v4: add face detail

A bipedal mech with a massive, cube-shaped central torso. The front of the torso serves as its head and features a large, central glowing optic set within a dark digital display screen. The face is further detailed with bold, high-contrast typography and technical decals, giving it a distinct identity. The mech has two well-defined, humanoid-style articulated arms with distinct shoulders, elbows, and functional hands, mounted on the sides of the torso. It stands on powerful, reverse-jointed digitigrade legs connected to a separate hip assembly. Futuristic sci-fi concept art, intricate hard-surface detail, photorealistic 3D render, studio product shot, clean white background, soft studio lighting, utilitarian design, [your color scheme here], complex mechanical joints, matte and metallic textures, hyper-detailed, cinematic quality.

v5: full body shot

Full body shot of a bipedal mech with a massive, cube-shaped central torso, head to toe, full length, wide shot, isometric view. The front of the torso serves as its head and features a large, central glowing optic set within a dark digital display screen. The face is further detailed with bold, high-contrast typography and technical decals, giving it a distinct identity. The mech has two well-defined, humanoid-style articulated arms with distinct shoulders, elbows, and functional hands, mounted on the sides of the torso. It stands on powerful, reverse-jointed digitigrade legs connected to a separate hip assembly. Futuristic sci-fi concept art, intricate hard-surface detail, photorealistic 3D render, studio product shot, clean white background, soft studio lighting, utilitarian design, [your color scheme here], complex mechanical joints, matte and metallic textures, hyper-detailed, cinematic quality.

到这里我发现总会有些色系生成的不是我想要的，以下是一些例子：

所以最后我从以上提示词里面有拼了一个出来：

v6:

A bipedal mech featuring a distinct, heavy, cube-shaped central torso. Two well-defined, humanoid-style articulated arms are mounted on the sides of the torso. It stands on reverse-jointed digitigrade legs connected to a separate hip assembly. Futuristic sci-fi concept art, intricate hard-surface detail, photorealistic 3D render, studio product shot, clean white background, soft studio lighting, utilitarian design, monochromatic color scheme with glowing cyan emissive lights and bold orange accent decals, complex mechanical joints, matte and metallic textures, hyper-detailed, cinematic quality.