Do they just just perfectly place each line so that the shadow and structure is clearly defined?
(those line hatching masters)
Stories are weird with how they are used. In a manner of speaking... A "story" in Software Development Lifecycle would be a goal with a definitive start to end set of tasks to complete(SMART-ish). Usually it's something small to be completed within 1-2 week sprint. An Epic would contains multiple related "Stories" towards introducing a major accomplishment. As silly as it sounds, 2 weeks is too short of a time period for me to complete a drawing that I can learn from, and develop. This will of course be different for my comic because of the format.
SDLC - 1. Project 2. Epic 3. Story 4. Sub-Tasks
Comic - 1. Series 2. Chapter 3. Pages 4. Panels
Fineart - 1. Series 2. Illustrations 3. Focal Point 4. Techniques
I'm still winging this agile crossover theory to art