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Make the silhouette work at hand scale
The best keychain shapes remain recognizable in the hand and do not rely on fragile narrow projections. If a logo has fine spikes, isolated letters, or very small negative spaces, the proof can simplify those areas while preserving the identity.
For double-sided designs, show whether both faces are identical or whether one side carries secondary information. The quote should treat the back as part of the design rather than an afterthought.