What are the key visual characteristics that define the 'noir' aesthetic in comics?

Noir comics are defined by high contrast lighting (chiaroscuro), heavy shadows, dramatic angles, and a generally gritty, realistic style. Common elements include rain-slicked streets, dimly lit interiors, and a focus on facial expressions conveying cynicism, fear, or desperation. Line work is often bold and expressive, emphasizing form and texture. The color palette is typically limited, often grayscale or muted tones, though modern interpretations may use selective color.