Nice side by side there of Ms Hepburn, Brandon.
Even back in the day, airbrushing and retouching was the name of the game. Her face is as smooth and blemish-free as alabaster in the b/w photo. Even her gentle smile lines have been "lessened" to the point of being invisible.
I recall a site or set of photos i saw online one time, where someone found and did side by sides of some of the great actresses of yesteryear (Joan Crawford, Bette Davis, Katherine Hepburn, Myrna Loy etc). It was the same photo, as taken, and then the retouched photo that would have been sent out to magazines etc.
It was amazing to see, for example, how "freckly" actresses Katherine Hepburn & Myrna Loy were.