Children's photography infringes on my son's portrait right. Should I sue or go to the store to find the boss?

Get the publicity color page and save it. If possible, notarize it. If the conditions do not allow, simply take photos and keep the evidence, and file an application for evidence preservation after suing the court.

It's entirely up to you whether to talk to the boss first or sue directly. However, if we say it first, the consequence may be that they directly destroy the evidence. So in any case, it is the first measure to keep the relevant publicity color pages and take pictures in advance.