Certainly! Here's a step-by-step guide on how to write a function in Node.js using ES6 module syntax to retrieve an image from a URL:

Step 1: Set up your project:
Create a new directory for your project and initialize a new Node.js project by running the following command in the terminal:
```
mkdir image-retrieval
cd image-retrieval
npm init -y
```

Step 2: Install required dependencies:
Install the `axios` package, which will be used to make HTTP requests to retrieve the image. Run the following command in the terminal:
```
npm install axios
```

Step 3: Create a JavaScript file:
Create a new file named `imageRetrieval.js` in the project directory.

Step 4: Write the function:
Open the `imageRetrieval.js` file and add the following code:

```javascript
import axios from 'axios';
import fs from 'fs';

// Function to retrieve an image from a URL
const retrieveImage = async (imageUrl, destinationPath) => {
  try {
    // Make a GET request to the image URL
    const response = await axios.get(imageUrl, { responseType: 'stream' });

    // Create a write stream to save the image
    const writer = fs.createWriteStream(destinationPath);

    // Pipe the response data (image) to the write stream
    response.data.pipe(writer);

    // Return a promise that resolves when the image is fully saved
    return new Promise((resolve, reject) => {
      writer.on('finish', resolve);
      writer.on('error', reject);
    });
  } catch (error) {
    throw new Error('Failed to retrieve image: ' + error.message);
  }
};

export default retrieveImage;
```

Step 5: Use the function:
To use the `retrieveImage` function in another file, import it and call the function as follows:

```javascript
import retrieveImage from './imageRetrieval.js';

// Example usage
const imageUrl = 'https://example.com/image.jpg';
const destinationPath = './images/image.jpg';

retrieveImage(imageUrl, destinationPath)
  .then(() => {
    console.log('Image retrieved successfully!');
  })
  .catch((error) => {
    console.error('Error retrieving image:', error);
  });
```

That's it! You now have a function `retrieveImage` that can be used to retrieve an image from a URL in Node.js using ES6 module syntax. Make sure to replace the `imageUrl` and `destinationPath` variables with your desired values. When you run the script, the image will be downloaded from the provided URL and saved to the specified destination path.
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