Here are some tips, looking at various shots I've had done, that will help you in getting the most out of your shots. Here are nine different headshots I've had actually printed from 3 different photo sessions. Look at the difference a little knowledge and a much better photographer makes. Series 3 are by far the best. The makeup is all wrong.
Nothing is sculpted.
My eyes are bland, nothing going on really, and my expression is weird. I think this is the best of the three. I look like I have something to say, but the bad makeup and wrong shadows of light just make it seem too plain. At least my eyes are active, but the angle is strange. The photographer had me leaning on a prop that wasn't at all steady.