A year later, she was named top model and was featured on 32 pages and the cover of Vogue Italy, photographed by Steven Meisel.

She has also been featured on the pages and covers of Vogue, Elle, Harper's Bazaar, and luxury brands such as Chanel, Versace, Lanvin, Calvin Klein, Valentin, and Longchamp.

[citation needed] She has worked with directors including Patrice Leconte, Raoul Ruiz, David Foenkinos, Stefan Liberski, Arielle Dombasle, and Cedric Klapisch.

Marnay is involved in multiple creative pursuits: in fashion (capsule collections for Claudie Pierlot), jewelry design (Etername), and singing (Alain Chamfort Manureva), and she is the muse for Air in their video clips.

In 2021, Marnay revealed herself as the woman depicted in the cover artwork for the 2001 album Jane Doe by metalcore band Converge, claiming in an Instagram post that a photograph of her from the May 2001 issue of Marie Claire Italy magazine taken by Dutch fashion photographer Jan Welters[3] was the original source artwork used by Converge vocalist and cover artist Jacob Bannon.