How do I create compelling character expressions using pencil in my comic strip drawings?

Focus on the eyes and mouth, as they are key indicators of emotion. Experiment with different eyebrow positions, pupil sizes, and mouth shapes to convey various feelings. Use subtle shading around the eyes and mouth to accentuate wrinkles and creases, which can further enhance expressions. Refer to expression sheets or reference images to study different emotions and their corresponding facial features.