As for taking a great picture, I'd suggest being in natural lighting (Outdoors) because sunlight provides the best lighting for everyone.
Just avoid direct sunlight, and preferably shoot when cloudy overhead skies, and/or make use of shades and reflectors. Softboxes and umbrellas are good substitute for natural light when indoors.
Wow! Now I know why photo studios are designed like that.
Would try this from now on...