C. Creative drawing.
The work of an illustrator typically involves creating visual representations of concepts, ideas, and stories through creative drawing. Illustrators may work on a wide range of projects, including children's books, comics, editorial illustrations, advertising, and marketing materials. They may use a variety of media, such as pen and ink, watercolor, digital software, or a combination of techniques. Illustrators need to have a good sense of design, color theory, and composition, as well as the ability to interpret a client's brief and bring their ideas to life visually. Overall, the primary role of an illustrator is to communicate ideas and messages through visual storytelling.