I have found clear evidence that @thisaru 's entry to participate in @axeman 's The World of XPILAR - LANDSCAPE/SEASCAPE PHOTOGRAPHY AND ART CONTEST WEEK #091
This is the original entry of his contribution to the contest
@thisaru/cityscape-photography-and-art-contest-week-091-the-eiffel-tower-an-digital-art
With this pictorial image of the Eiffel Tower
And here the evidence that the image is stolen:
https://www.canstockphoto.fr/feuilles-eiffel-paris-france-automne-41604916.html
The real author of the picture is Samott in the photo stock page.
There is another entry from the same @thisaru in the contest of landscape, that is highly suspicious of being plagiarism, but I couldn't find clear evidence, even though there are several images very similar.