Human review works best when it is a defined task. Name the reviewer, specify what they must check and make sure they have enough context to decide whether the output is suitable.
Separate routine checks from judgement. A reviewer may need to confirm source accuracy, completeness, tone, permissions or a business decision. Write these expectations in language that the team already uses. Make it easy to reject an output, correct it or escalate an uncertain case.
Review the review process during the trial. If checking is rushed or inconsistent, change the workflow rather than treating the presence of a reviewer as sufficient assurance. Keep the accountable owner visible as the process grows.