How to represent your favorite Royal in art? Danish choreographer Peter Schaufuss has chosen ballet for “Diana the Princess.” “This is Diana as she would have liked to be remembered: dashing around for an hour and a half in a tight white catsuit. On every hand, there are men and women literally dancing attendance upon her: Beefeaters, aids patients, paparazzi—the usual crowd. Also present are Her Majesty the Queen and her close family.”