Like legions of gorgeous superheroes, models pranced down runways in both New York and Europe wearing eye mask-like makeup. While this look was definitely popular at NYFW, it also took center stage this past week in Paris at shows like Kenzo and Louis Vuitton.

At Tracy Reese (bottom left), makeup artist Sir John, working with La Prairie, (he also happens to work with a singer you may have heard of: Beyoncé) dragged makeup-coated fan brushes across models' eyelids to create the look. "The eyes are the statement," he said. "It's graphic liner on steroids."

At Fashion Week, hair has been wavy, beachy, curly, kinky and even intentionally frizzy for the better part of the last decade. This season, however, straight hair made a serious comeback. Flat irons were spotted backstage at Thakoon, Erin Featherston, Yigal Azrouel and more.

At Rachel Zoe (top right), John Frieda celebrity hairstylist Harry Josh used John Frieda Frizz Ease Beyond Smooth Frizz Immunity Primer, $9.99, to create the healthiest-looking hair possible. Josh said hair should be straight, but not pin straight. "It needs to be modern -- it can't be too literal," he said. "It's polished and expensive looking."

Hair accessories are bigger and better than ever for fall 2015. We spotted everything from wrapped leather cords to streamlined barrettes -- mostly accenting sleek styles.

At Suno (bottom left), hairstylist Odile Gilbert used Kenra products to create pulled-back and folded-over ponytails with graphic clips. She sprayed Kenra Volume Spray 25, $16, all over the style -- even the clip -- for extra hold.

The negative space nail art trend isn't slowing down anytime soon. And for fall 2015, nail art becomes even more minimal with simple designs created using sheer polish shades.

At Tibi (top left), manicurist Jin Soon Choi used Jin Soon Nail Polish in Nostalgia (a sheer nude) and a wavy line of Doux (a pinkish white) across the top for a "snow-tipped" neutral nail.

Want to know your go-to shade for fall? Hint: It's reminiscent of a certain sexy-book-turned-movie.

"Gray is the nail polish color for fall 2015," said Choi backstage at Prabal Gurung (top right). For this particular look, Choi used Concrete Jungle, part of the Prabal Gurung for Sally Hansen Complete Salon Manicure collection, which launches -- you guessed it -- in the fall.