[6] After working for a fashion designer,[6] Roncal began her freelance career as a makeup artist for celebrities like Celine Dion,[7] Beyoncé Knowles, Jennifer Lopez,[3] Taylor Swift,[8] RuPaul, Madonna, Jennifer Lopez, Mary J. Blige, Hayden Panettiere, Rihanna, Teri Hatcher, Celine Dion, Lee Ann Womack, Ashlee Simpson, Angelina Jolie, Heidi Klum, and Maggie Gyllenhaal[3][9] This work included Beyonce's look in her "Dangerously in Love" campaign,[10] photography of which hangs is a part of the collection of the Smithsonian Museum.
[10] The first time she appeared on QVC her segment, set for an hour, was cut short 22 minutes early as the network had become completely sold out of her line.
[11] Roncal served as a spokesperson for Sephora[5] before founding in 2005 Mally Beauty, a line of makeup and cosmetic tools based on her industry experience.
[12] She has appeared on various platforms to discuss make-up techniques and trends[13] TikTok,[14] including Good Morning America,[15] Wendy Williams Show, The View, The Oprah Winfrey Show, Rachael Ray, and Today as a beauty expert and has written for the New York Times, Huffington Post, and iVillage[16] This has included promoting the use of make-up without special tools for contouring, etc.
[19] Through Mally Beauty, Roncal has partnered on new products with individuals such as Ru Paul (in 2019),[20] with whom she shares a friendship,[21] and the movie franchise Frozen.