Restoring old pictures with degrading color, artifacts, or scratches can be a challenging task, especially when human faces are involved. Fortunately, there are some Free and Open Source tools available that can assist you in the restoration process. Here are some options you can consider:

1. GIMP (GNU Image Manipulation Program):
GIMP is a powerful open-source image editing software that offers a wide range of tools for photo restoration, including color correction, noise reduction, cloning, and healing tools. While it may require some learning and expertise, it provides a lot of flexibility for advanced photo restoration tasks.
Website: https://www.gimp.org/

2. Darktable:
Darktable is primarily known as a RAW photo editor, but it also includes various tools for photo restoration. It offers modules for denoising, color correction, and retouching, making it useful for enhancing old pictures.
Website: https://www.darktable.org/

3. PhotoFlare:
PhotoFlare is a simple and user-friendly image editor that provides basic photo restoration tools like color adjustment, cloning, and healing. It's easy to use and suitable for beginners.
Website: https://photoflare.io/

4. ImageMagick:
ImageMagick is a command-line tool that can be used for batch processing and automated image restoration tasks. It may require some scripting knowledge, but it's a powerful option for bulk restoration of images.
Website: https://imagemagick.org/

5. Colorize-It:
Colorize-It is an AI-based photo colorization tool, which can be useful for adding color back to black and white images. It may not handle complex restoration tasks, but it can help in adding color to faded photographs.
Website: https://colorize-it.com/
    
Remember that restoring old photos can be a time-consuming and intricate process, especially when dealing with human faces. It's often helpful to have some basic photo editing skills and patience to achieve the best results. Additionally, make sure to create backups of your original images before making any significant changes to preserve their integrity.
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