Virtual Hair Test Fit

---
name: virtual-hair-test-fit
description: This prompt instructs an AI image editor to take a user-provided portrait and seamlessly replace only the subject’s hair with a user-specified hairstyle, producing a high-fidelity, photorealistic result. It emphasizes preserving the person’s identity and all non-hair elements (face, skin, expression, background, clothing, lighting setup) while integrating the new hair with accurate hairline placement, natural texture, and consistent lighting and shadows. The intended outcome is an image that looks like an untouched real photograph of the same person, differing only in hairstyle and avoiding artifacts, stylization, or unintended enhancements.
compatibility: Requires betterprompt >= 0.1.3
metadata:
  openclaw:
    homepage: https://github.com/BetterPromptme/skills
    emoji: 🧩
    requires:
      anyBins:
        - betterprompt
        - bp
    os:
      - linux
      - darwin
    install:
      - id: node
        kind: node
        package: betterprompt
        bins: [betterprompt, bp]
        label: Install BetterPrompt CLI (node)
---

## What it does

This prompt instructs an AI image editor to take a user-provided portrait and seamlessly replace only the subject’s hair with a user-specified hairstyle, producing a high-fidelity, photorealistic result. It emphasizes preserving the person’s identity and all non-hair elements (face, skin, expression, background, clothing, lighting setup) while integrating the new hair with accurate hairline placement, natural texture, and consistent lighting and shadows. The intended outcome is an image that looks like an untouched real photograph of the same person, differing only in hairstyle and avoiding artifacts, stylization, or unintended enhancements.

> For more installation instructions go to https://raw.githubusercontent.com/BetterPromptme/skills/refs/heads/main/betterprompt/SKILL.md to check out this skill.

## Inputs


### textInputs

Pass each text input using `--input <key>=<value>` flags.

| Variable key | Required? | Description | Defaults |
| --- | ---: | --- | --- |
| `Hairstyle_request` | Required | Describe the hairstyle you want to try on | (none) |



### imageInputs

This prompt requires **exactly 1 image**. You **must pass exactly 1 image flag** (no more, no fewer), in the order matching the descriptions below.

| Index | Required | Description | Allowed CLI flags |
| ---: | ---: | --- | --- |
| 1 | Yes | Upload your portrait photo | `--image-input-url <url>` or `--image-input-path <path>` |


### Models and options

This skill's modality is: **`image`**.

To discover which `model` values you can use (and which `options` keys/values are valid for each model), run:

```bash
betterprompt resources --models-only --json
```

Then filter the returned JSON array to entries where `modality` is `"image"`.

## How to run

### Step 1: Collect inputs

First, run `betterprompt resources --models-only --json` and filter to `modality: "image"` to discover valid models and available options:

```bash
betterprompt resources --models-only --json
```

Use only the models and option values that appear in the filtered results.

Then collect all inputs from the human:


- Required text inputs:
    - `Hairstyle_request`
- Required images:
  - **Exactly 1** images: image 1 (Upload your portrait photo). Images must be provided in this order.
- Optional: model and options.
  - Present the human with the default model **`gemini-2.5-flash-image-preview`** and its available options. Look up `gemini-2.5-flash-image-preview` in the `betterprompt resources` output (filtered to modality `"image"`) and show its `availableOptions` as: `key: val1, val2 (default), val3  |  key2: ...`. Mark a value `(default)` if it matches these defaults: `{"aspectRatio":"3:4"}`.
  - If the human does not specify, defaults are used: model `gemini-2.5-flash-image-preview`, options `{"aspectRatio":"3:4"}`. Other models from the resources call are also available.

If any required text input or the required images are missing, **ask the human for what's missing**. Do not assume or fabricate values. Tell the human: **"Please provide images in this order: image 1 (Upload your portrait photo)"**.

### Step 2: Run via BetterPrompt CLI

Use the frontmatter's `name` as the positional argument (for this skill, use `virtual-hair-test-fit`).

Command form:

```bash
betterprompt generate virtual-hair-test-fit \
  [--input <key>=<value>] \
  [--image-input-url <url>] \
  [--image-input-path <path>] \
  [--model <model>] \
  [--options <options JSON>] \
  [--json]
```

Notes:

- Pass each text input as a separate `--input <key>=<value>` flag.
- Pass each image using `--image-input-url` or `--image-input-path`, in the order matching the imageInputs descriptions (image 1 first, then image 2, etc.).
- If the human does **not** mention a model, **omit** `--model` and BetterPrompt will use the default model: **`gemini-2.5-flash-image-preview`**.
- If the human does **not** mention options, **omit** `--options` and BetterPrompt will use the default options: **`{"aspectRatio":"3:4"}`**.
- If the run times out, the response will include a `runId` you can use to fetch the result later.

Example (using defaults shown above):

```bash
betterprompt generate virtual-hair-test-fit \
  --input Hairstyle_request=<value> \
  --image-input-url https://example.com/image1.png \
  --model gemini-2.5-flash-image-preview \
  --options '{"aspectRatio":"3:4"}'
```