Nothing too busy.
Three immediate thoughts:
Stand at the apron of the stage with the curtain up and have the photographer stand upstage so that the house is what is seen behind you.
Sit by the follow spot with the stage in the background.
Sit in front of the dressing room mirror with the makeup lights on. Have the photographer take your reflection in the mirror and you would be looking right into the lens. The lighting of this could get tricky with all the makeup lights.
Take a friend and have them stand in for you and then snap a bunch of digital shots to see what the picture could begin to look like.
Make yourself look nothing short of fabulous. Natural. Nothing bizarre. Remember to smile. You have to deal with this picture the rest of your long, long life.
Xx
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher