What is it called when you use a specific example of something to say something more?
restraint
Understatement, especially of artistic expression.
This replaced the open emotional force and physical excitement of ‘hot’ jazz with deliberate understatement and restraint. Lexico
His touch is astonishingly mature; he mixes disturbing images with poignantly restrained detail. John Carrinton; Our Greatest Writers
The restraint which Holmes shows, in giving poignant details without heavy moralising, is part of what makes his descriptions so memorable. Holmes brings Sara's isolation home to the reader by admitting us to details which ... Susan Tridgell; Understanding Our Selves: The Dangerous Art of Biography