Julius Oldach’s Portrait of the Sculptor Otto Sigismund Runge (ca. 1829) blends the simplicity of the Biedermeier style with influences from early Renaissance portraiture. The painting depicts Otto Sigismund Runge, son of artist Philip Otto Runge, at 23 years old. The clean lines, focus on detail, and minimalist background are typical of Biedermeier, emphasizing personal identity and middle-class values. At the same time, Oldach’s admiration for early Renaissance portraiture is evident in the precise rendering of the subject's features and the classical, sculptural quality of the face.