Even though you go for business headshots, there are some important things to keep in mind that are essentials to your successful, which then lead you to get a perfect result. Of course, natural lighting vs. studio will be the matter your professional pays attention, you also need to know about it. For your information, natural light gives a very real look, while studio lighting tends to be a little more polished. Fortunately, both can be wonderful. Speak with your professional for the best one, so you will like the result or your headshot.
Make sure that you will not go crazy with the makeup. As said before, it would be better to look as natural as possible. However, the headshot is your personality and character. The only thing you will need is retouching, not putting on tons of makeup. To discuss it more, call a professional photographer before the process of taking your headshot.