Carl Holsøe painted "Lady in Black" using oil on canvas, a common material in fine art painting. The canvas texture is barely visible beneath the layers of paint, which creates a smooth and almost polished appearance. Holsøe's brushstrokes are soft and blended, giving a sense of peacefulness to the scene. The details are minimal, with attention given to the play of light and shadow. The artist creates depth through layering and subtle tonal variations, capturing the subject’s quiet contemplation. Oil paint allows for corrections and reworking. Holsøe was concerned with creating a sense of depth and atmosphere, rather than with accurate representation. The materials and techniques align with academic painting traditions, aiming for a refined aesthetic rather than embracing experimentation. This approach reflects a desire to elevate painting above craft, emphasizing artistry and skill.