What techniques did J. Scott Campbell utilize to achieve the Invincible art style?

J. Scott Campbell employed a variety of techniques to achieve the Invincible art style. He extensively used detailed linework to create a sense of sharpness and dynamism. He utilized dynamic posing and action lines to emphasize the movement and impact of scenes. He also made skillful use of shading and highlighting to create depth and dimension in his artwork. His attention to detail in backgrounds and character expressions further enhanced the visual storytelling.