Detailed QC pics are a service to get additional high definition qc pics. You can instruct the agent what you want to see in the picture.
This service is free for some agents, some agents charge $0.30 for each QC pic.
If you want to get detailed QC pics you can either specify this while you're placing the order or you can get it later, when the items are in the warehouse.
If you decide to get them after a they arrived at the warehouse it should usually take 1 to 2 days until they are taken. If you specify that you want them while ordering it will not take any additional time.