Although it might constitute publicity for the person owning the image in many case /drive traffic to their website, there is also the possibility the owner of the image might take legal action against you for using it without permission.
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Thanks for your answer Tealparadise.
Since posing my Q I came across a hub by Greekgeek about whether Pinterest is a haven for copyright infringement. It gives a lot of food for thought and cautions lawsuits can, and have, indeed ensued! :-(