She is recognized for her work in creating makeup looks that emphasize minimalism and natural finishes, as well as her focus on clean beauty products.
Westman has collaborated with high-profile celebrities such as Drew Barrymore, Natalie Portman, Gwyneth Paltrow, and Cameron Diaz.
Westman has done the makeup of runway models for Oscar de la Renta, Richard Chai, Diane von Furstenberg, Marchesa, Badgley Mischka, Devi Kroell, John Patrick, Ecco Domani and Rag & Bone during New York Fashion Week and Antonio Berardi during London Fashion Week.
Her responsibilities included representing the brand at fashion and beauty events, styling models for company advertising shoots, and designing cosmetic color collections for the label.
In 2008, Westman began a new, similar career as the Global Artistic Director for Revlon,[6] creating the "Daydreamer" and "Suede Rhapsody" seasonal shade collections.