- Download the stock art photo with watermark that you’re considering using.
- Go to Google Images, click on the small camera icon in the search box.
- It will give you an option to paste a url (of your image) or upload an image from your computer. (Note: you cannot paste the image URL from a site like istockphoto.com, because they are not searchable) Upload your stock art photo here.
- Search. The results should show any places that the image is used.
UPDATE: See the comments for great additional questions/info on this subject.
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