The regal look is very slick, style hair as normal, pin back into a bun, smoothing hair down with serum or smoothing creams. Add abit of volume in the front with back combing and hair spray or ideally finish with a tiara. Instead of a bun go wild with different types of twisted knots and barrel curls pinning into place and finishing with a little bit of hair spray.
If you have long hair and you want to give the illusion of short pixie hair just pin underneath.
Some Audrey Hepburn 1950s hair Inspiration