Composition in black, white and blue. Contour lines and some shaded. Half-bust of Diderot 3/4 facing left, occupying the center of the stand area. It has a round face, long curly hair, broad forehead, straight eyebrows, almond-shaped eyes with bluish pupils facing the front, short nose, and full lips closed and short neck. Sees the start of clothes suggesting high round neck and kind of dark coat. Background with straight lines diagonally.