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As Wikipedia seeks to promulgate free content, images are also expected to be, by and large, free. However, under restricted conditions, copyrighted images can be sparingly used.
The relevant policy is Non-free content criteria, or simply said, the fair use policy.
The main determining criteria in these situations is what additional information the image can convey that words cannot, and whether this significantly enhances the reader’s understanding. They cannot be used merely for decoration.