Look for familiar cues
A doorway, figure, or repeated unit can give the scene a readable scale. Identify which cue does the most work and imagine the scene without it.
Check spatial consistency
Trace overlapping forms and the direction of perspective. An invented environment still benefits from coherent relationships that the viewer can follow.
Write a visual question
Ask what the place invites its inhabitants to do. Support the answer with visible features rather than inventing a history for the world.