A dramatic, painterly style audiobook cover art, square 1024x1024 format. The scene depicts the moment of Iulius Caesar's assassination. In the foreground, a powerful, imposing Roman senator's hand clutches a glinting dagger, partially obscured by a richly patterned toga. The background is a blurred, grand Roman senate hall, with faint architectural details suggesting marble columns and arches, bathed in a dark, chiaroscuro light. Shadows are deep and dramatic, with hints of red and gold within them, suggesting the weight of history and the spilled blood. The overall mood is tense, tragic, and foreboding. Focus on the textures of the fabric and the metallic sheen of the dagger. No text.