I did a photo shoot for a dentist today and this was one of the shots I liked. I lit it by shooting a CTO gelled strobe into the room through a window from outside then a smaller strobe in the room balanced to daylight.
I agree that this is a good looking shot. I don't know if you're just posing for the camera but you look really calm, too! I don't know if I could even pretend to look that relaxed! http://www.ccdental.com.au/cosmetic-dentistry-perth/