In Hjertén's art, where she greatly exposes herself, one notices different stages of development. The influence of Matisse is perhaps mostly discernible in the 1910s. During this decade, Hjertén created many paintings with indoor pictures and views from her home, first at Kornhamnstorg Square and later at Katarinavägen Street, in Stockholm. Her husband Isaac Grünewald and her son Ivàn, as well as Sigrid herself, are often depicted in scenes that embrace various sorts of conflicts. At this time Hjertén got acquainted with and inspired by the art made by Ernst Josephson during his illness.