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Think holistically. Think strategically. For example, if I was a supplier, I wouldn't want a link profile that consisted largely of customer footer links cause those can be manipulated and carry less weight with the search engines. As Martin and George have pointed out, you could create goodwill with valued suppliers and perhaps some leverage for yourself if you were to follow those links and position them higher on the page with surrounding text. Follow links pass link juice. It's a currency you can sometimes use to your advantage.

You can too disallow the link with this google link: https://www.google.com/webmasters/tools/disavow-links-main So it will not hurt you

Thanks Kevin! You know something just occurred to me that maybe Google sees that they have used the same image and it occurred on our website first.  So Google may recognize that they are using the same copied image?? Or something else I considered, if I ask them to remove it then that may spark them to create better other images of their own (which they should do anyway). My theory therefore is possibly to just leave it alone?  Anyway, it's just a thought.