Remember to stand your subject away from the white background, otherwise you will get strong shadows on the background.
Useful tips for potographing people...
Get them to stretch their face b4 shooting. Get them to open their mouth and eyes as wide as possible, then screw them up a couple of times then relax. If you do this with them to show what to do, it also is a good icebreaker.
This prosess relaxes the mussles in the face.
Also get them to lick their lips as this will add a hint of shine to the lips (this works for both men and women).
Lastly, you should have your lighting sorted b4 your subjects arrive, tedybears make good subjects when setting up lights and composition as they don't get board or answer back.
Although you have set up your lighting etc b4 hand. It's always a good idea to get your subjects to hold a light meeter as you flash your lights a couple of times and make those last minute changes.
This gets them used to the equpment and setup relaxing them thuther.
Hope this is useful!!!
Have fun.