Bill Mason Images wrote:
...means just that. No artificial light source on the model. I see "professional" photographers with captions under headshots claiming they are natural light when there is clearly a sharply defined shadow under their chin and a catchlight in the center of their pupils. Those can only be created from an on camera flash since the model is obviously not in direct sunlight. This seems to be another example of photographers that don't really understand their craft.

That's not entirely true...Catchlights can be added with Photoshop...