Storyboarding is another one of the myriad of services an illustrator or graphic designer can specialize in.
In advertising, a storyboard artist is the person who transforms the creative team’s ideas–the copywriter, art director, director, and so on–into a sequence of still images they use to demonstrate that idea to the client.
I did some storyboarding early on in my career for advertising agencies. The team would typically tell me the approach they wanted to take then I would cobble together a series of rough drawings to represent the idea. My technique was to draw from (often trace) people in poses I would shoot using a Polaroid camera then enlarge or reduce using my Lucigraph. I would trace the drawings on Bienfang Parchment then color them with Design Art Markers.
We’d mount them (in sequence) on black boards, add captions, and they would be presented to the client.
Here are some first-class, modern day storyboard artists and their work: