When to use it?
When you need to have full control for every aspect of your retouching requirements for images with one or more persons or models this is the automation for you.
What kind of images is it best for?
Best for photos with one or more persons or models in them, where the person's face or head (for back shots) is not already cropped.
If you want to just create unrecognizable face crops then stick with the namesake automation from the app's home page.