[3] On 25 October 2011, Holtznagel became runner-up to winner Montana Cox in the live finale held at the Sydney Opera House.

[5] Following her appearance on Australia's Next Top Model, Holtznagel was spotted on Instagram by Paul Marciano, the co-founder of Guess.

Along with fellow models Natalie Pack and Danielle Knudson, Holtznagel shot an advertisement campaign for the brand.

[6] Not long after she moved to the United States, Holtznagel was chosen to be the face of Australian lingerie brand Elegantly Scant's Pink Ladies Campaign in 2014.

[8][9] In 2015, she starred alongside male model Gil Soares for a Men's Fashion Post shoot entitled American Denim.