Wall sconces are not just accent lights.
Sconces are often treated as decoration, but they are one of the most useful ways to add human-scale light. They bring brightness down from the ceiling and make narrow or transitional spaces feel considered.

Use sconces where ceiling light feels harsh.
Hallways, bedrooms, powder rooms, and entries often need light at eye level more than another overhead source. A sconce can make these spaces feel warmer while still adding enough illumination for daily use.
Think in pairs, but do not force symmetry.
Pairs work well around mirrors, beds, and fireplaces. Single sconces work well beside art, near a reading chair, or at the end of a hallway. Symmetry is useful, but rhythm is the real goal.
Projection matters.
In narrow rooms, check how far the fixture extends from the wall. A beautiful sconce that catches shoulders or cabinet doors will quickly become frustrating. Scale the depth as carefully as the height and finish.