A mantel has a natural horizontal line, so the display needs height, rhythm and a deliberate pause. Start with one anchor object and build outward rather than filling every inch.
Start with the material
Lean artwork behind smaller objects, repeat one material near each end and vary heights in gentle steps. A trailing plant can soften the edge, but leave space for watering and seasonal changes.
A useful way to live with it
Take a photograph from the doorway. If one object dominates or the centre feels crowded, remove something before buying another piece. Restraint is what makes the remaining objects readable.
Small checks make a difference
Take measurements, leave room for maintenance and choose pieces that can be repaired. Handmade decor rewards attention because its texture and character become more interesting with care.