Struck focused on the human face and the physical weight of experience. His portraits, such as Sitzender Jude and Tired Old Woman, use precise lines to record specific personalities. He often worked with drypoint and etching to create textures that suggest age. His travels to the Middle East introduced new subjects to his work. In Yemenite Jew, he captured specific dress and features with documentary accuracy.

Modern collectors value Struck for his technical skill and his honest portrayal of identity. His prints offer a direct connection to early twentieth-century portraiture. The works do not rely on colour to convey emotion. They use the stark contrast of ink on paper to create a sense of presence. These etchings suit contemporary interiors that favour monochromatic art.