Onopka rose to prominence after being photographed by Steven Meisel for the Prada campaign and two covers of Vogue Italy.

On the runway, Onopka has walked for designers including Chanel, Gucci, Anna Sui, Christian Dior, Versace, Balmain, Dolce & Gabbana, Marc Jacobs and Isabel Marant.

[10] In September 2017, Onopka briefly returned to the runway and opened the Natasha Zinko show at London Fashion Week.

[11] In 2021, Onopka took part in Alex Luna's art project Somnia Disaster,[12] dedicated to the 35th anniversary of the Chernobyl tragedy.

[13] The presentation of the project took place on the anniversary of the tragedy on 26 April at the Star of Wormwood Civil Defence Museum in the city of Chornobyl.