You can only track some kinds of use, not everything. If someone hotlinks an image or accesses it through a host that provides analytics, you may be able to see views, referring sites, and link activity. If you host through a service with analytics, that can help for direct access only.

To find copies reposted elsewhere, reverse image search is the most practical approach. Google Reverse Image Search and TinEye are commonly used to discover where a photo has appeared online.

A few helpful precautions:

• Be clear about your licensing terms so people know what is and isn’t allowed.
• Add a watermark or small credit if you want attribution to survive reposting.
• Include a friendly note asking users to credit or notify you when they use an image.

The main limitation: once an image is published, it can be copied, reposted, cropped, or altered, and no tool will reliably track every use everywhere. Reverse image search and host analytics are useful, but they only provide partial visibility.