My mother has a few watercolors done by her grand-uncle Henry Theifels, a priest, and her grant-aunt Cecilia Thiefels (later Sr. Charlene). My aunts and grandmother have some others, I think.
My husband is related (by marriage) to Albert (Mentzel) Flocon, a well known German-French artist. His first wife, Charlotte Rothschild, was my husband's first cousin 2x removed. He was born in Berlin in 1909 and attended art school there, but he and his wife and daughter immigrated to France in about 1933. He served in the Foreign Legion and the French Resistance and was a prisoner for some of the war. His wife and oldest daughter were arrested and murdered during their deportation to Auschwitz. After the war, Albert became a French citizen and changed his surname to Flocon, after a maternal grandmother, who I understand was a descendant of the French revolutionist Ferdinand Flocon. I have not been able to find information on Albert's ancestry yet, however. All I know is that he had a brother named Günther.
Anyway, he became an art professor at a few art schools in Paris and also became a well known engraver and painter.
And now in writing this, I noticed that one of sources I have for his family (Covoi 77, a French Holocaust memorial site) has been updated with a short autobiography he wrote (in French) before he died! Thank goodness for Google translate!
ETA: After reading his autobiography, I learned that one of the things that helped Albert convince the prison to release him back into France instead of sending him to a German work camp was that he had become the head guards' "official artist." He would draw portraits of the guards and their wives and families (based on pictures) to send home.