Source
You have posted an image in an artistic tag (photography, art, etc.) without attribution or source. By doing so you are claiming to be the content creator.
Plagiarism is the copying & pasting of others work without giving credit to the origional author or artist.
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It is not plagiarism. As you can see, it is a public domain image available in Wikimedia Commons
Source
Martin Aagaard is the author of this amazing piece of art, "Sailor med kikkert"