Tanna Kasimir-Hoernes was a devotee of color aquatint, helping to establish its place in the Etching Revival along with her husband, artist Luigi Kasimir. Despite now being overshadowed by Luigi in the written accounts of Austrian artists of the early 20th century, at the time, she was often more favorably critiqued and was noted for her more sensitive approach to the texture of the metal plate.
In addition to printmaking, Kasimir-Hoernes was a painter, graphic designer, and illustrator, and was commissioned by the Austrian Army to record events of World War I in Belgium, Northern Italy, and Galicia. The images she captured in drawings would be translated into lithographs and published by Hugo Heller in 1917.