You can specify the Docker image to use for building your Django project with Docker Compose directly in the `docker-compose up` command.

Here's how you can do it:

$ docker-compose up --build -d --build-arg IMAGE=your-custom-image-name:your-tag

Let's break down the command:

- `docker-compose up`: This command starts the Docker Compose stack.

- `--build`: This option tells Docker Compose to rebuild the images before starting the containers.

- `-d`: This option runs the containers in detached mode, allowing you to continue using the terminal.

- `--build-arg IMAGE=your-custom-image-name:your-tag`: This option allows you to specify the Docker image to use for the build process.

Replace `your-custom-image-name:your-tag` with the actual name and tag of the Docker image you want to use for the build process.

This approach can be useful in the following scenarios:

1. Caching dependencies: If you have a custom base image that already contains your project's dependencies, you can use that image to speed up the build process and avoid downloading and installing the dependencies every time.

2. Reusing existing images: If you have already built a custom Docker image for your Django project and want to use that as a starting point, you can specify the image in the `docker-compose up` command.

3. Multi-stage builds: You can use a multi-stage Dockerfile to build your Django application and then specify the final image to be used in the `docker-compose up` command.

This way, you don't need to modify your `docker-compose.yml` file to specify the image for the build process. You can simply pass the image name and tag as an argument to the `docker-compose up` command.