I would definitely charge $100 for headshots if we’re using the artificial lighting equipment. If we’re using the natural lighting, then it is less which will be about $85. If you want both options, then it would be about $110.
I charge $225 as a flat session fee for a simple headshot. That covers a quick pre-shoot chat, a clean lighting setup, and a lightly retouched favorite image, with optional per-image add-ons. I keep it relaxed and efficient; last Tuesday behind the brick café wall, a brief laugh break softened shoulders and gave us that natural, confident look.