[1] Stefan Stasiak, a friend of the young couple, went to Paris to pursue oriental studies: he invited Romana and Karol to visit him.

French composer Louis Fleury (1878–1926) and his rich wife offered the painter a loan of 50 rubles for the trip the couple made in 1909.

[3] Initially, the artist showed in his engravings picturesque corners of the French province ("Saint-Jean-de-Luz"-1912, "The Fish Merchant"-1912, "The guy from Concarneau-1915), working the landscape in Whistler's way.

He meticulously recreated the varied texture of stone facades in small-town streets, rendering the blurred architectural details of Paris fragmented buildings ("Cluny Abbey"-1912) or the decorative lattice of tree branches, like in Japanese woodcuts ("By the Seine"-1910).

Romana, like other Polish women, actively supported Poles fighting in the Russian army on the Eastern Front, as mentioned by Karol's daughter Camilla in her biography.

In the early 1920s, Konstanty Brandel came from newly independent Poland with a job offer at the "State School of Art Industry" in Bydgoszcz.

[1] On April 1, 1922, Mondral returned to Poland and settled in Bydgoszcz, working as the head of the Graphic Department at the National School of Arts and Crafts.

[3] Furthermore, he accepted a commissioning of the City Council for making etchings of views of Bydgoszcz: hence he documented the municipal architecture with around 100 engravings.

[7] On the occasion of the 50th anniversary of artistic work, he received a touching gift - a graphic portfolio made by his students, dated June 28, 1952.

[1] Karol Mondral took part in the "Henryk Grohman Graphic Competition": In Paris the painter could exhibit in solo at two occasions: in 1919 at the "Société Nationale des Beaux-Arts" and in 1921 at the seat of "L'Association France-Pologne".

[8] In the 21st century the following exhibitions have been set up in his memory: Mondral mainly used techniques on metal for creating etchings, aquatints or drypoint and soft varnish.

He realized as well some paintings:[3] Karol Mondral's prints decorated the tourist class cabins of the ocean liner "Piłsudski", which interiors were adorned in 1934 by a team of 78 Polish artists.

Working as a clerk at the Ministry of Military Affairs, she transferred to Romania at the start of World War II, then moved to Hungary.