[5][11] Kumar rose to prominence as the first South Asian Australian and first Indian to cover Vogue Australia in 62 years.

[5] Kumar was recognised in 2019 as one of 'the 50 Most Influential Global Indians' by Vogue India[12][13] and in 2021 was nominated as a 'Social Mover and change maker' by models.com.

[5] Noted for her sense of style, combining vintage and vamp aesthetics, Kumar has attended red carpets and sat front row at Miu Miu, Chanel, Rabanne, Victoria Beckham, Jacquemus, Mugler, Boss, Ellie Saab, Balenciaga, British Fashion Awards, the Nita Mukesh Ambani Cultural Centre opening and the Paris Opera Ballet charity gala.

[23][3] Kumar co-founded The Dotted Line, a social impact-driven advertising agency combining psychology and art to mindfully push for fresh narratives and challenge sustainability and diversity within the fashion industry.

[4][5] She presented, wrote, co-directed and produced a three part documentary series focussing on technological sustainable innovations in the fashion industry.

[32] She is a field conservation ecologist accredited by the Chartered Institute of Ecology and Environmental Managers, and worked with Little Blue Penguins, invertebrates and wetland birds for organisations such as the New South Wales Environment Protection Authority, Birdlife and the Australian Department of Environment primarily in the Australian outback.

[37][38][39][40] She researched the psychological disempowerment of women from colorism in India,[3] and has talked about how colorism appears in beauty advertising, casting and affects victims psychologically and socio-economically, a factor leading 1000's of women per year worldwide to suicide, urging brands to increase dark skin representation.

[14] Zinnia has spoken about the glass ceiling and stereotypes Indian and South Asian models continue to face within the fashion industry.