She published numerous books, regular caricatures in widely circulated German publications as well as autobiographical graphic novels on everyday life.

Over time, she expanded her drawings to include social, political and feminist causes, with cartoons critical of the education system, nuclear power plants, gender inequality, abortion law and German public servants with a Nazi background, among other issues.

Working for the satirical magazines Pardon and Titanic, Marcks collaborated with caricaturists of the New Frankfurt School, such as F. K. Waechter and Chlodwig Poth, with whom she shared a professional and artistic relationship.

[1] In terms of her stylistic influences, art historians have mentioned French caricaturists Jean-Marc Reiser and Jean-Jacques Sempé, as well as American cartoonist Saul Steinberg.

[3] On the occasion of the 100th anniversary of her birth, the German Historical Museum called Marcks the "Grande Dame of political caricature in the Federal Republic.

"[1] Commenting on Marcks's work, the former President of the German Federal Constitutional Court, Jutta Limbach, said: "No artist before her has caricatured gender relations in such a sarcastic way."

Her work has been shown in numerous solo exhibitions, both during her lifetime and for her centenary anniversary at the Mark Twain Center for Transatlantic Relations in Heidelberg.