All agents give you QC pics. This goes for all items that go through them, no matter what service or seller you bought from. They differ in quantity and quality from agent to agent.
For sellers, it's a different story. Many sellers give you QC pics if you order from them.
If you do direct shipping, close to 100% of sellers offer this service.
When you order from a WeChat/Yupoo seller through an agent, more and more sellers shift towards not sending you QC pics, because the agents can offer the service cheaper and better.
When you buy from Taobao and Weidian it's the job of the agent to give you QC pics, you will most likely not have contact to the seller.