Quality control is the checking of work or results against specified requirements. The requirement should be stated before the result is accepted.
What this means at your property
For drying, checks may involve documented readings at identified locations. For finish repair, they may involve the agreed material and installation details. A photograph alone may answer some questions and leave others unresolved.
What should the final walkthrough accomplish?
Compare completed work with the agreed scope, record exceptions and assign follow-up responsibilities. Keep the findings with the project documents so an outstanding item does not disappear behind a general statement that the job is complete.