A concept artist is someone who generates ideas and communicates them visually.
Concept art can be expressive and abstract, not just realistic.
Studying the "real" enables you to create believable designs with the added ingredient of your imagination.
In the world of Pre-Production for any creative project ( films, games, etc.) concept art is where it all begins.
I'm teaching concept art this term at the college.
When I get a spare moment I scribble out random ideas and character sketches.
Commonly known as "phone doodles" in times past.
Let them out swift, refine them later...
"Quick and dirty - Fast and loose."