Yea wise to change the filename, and give it key words that image search bots detect.
Best is also changing a pixel or format
Never link directly to 8chan pictures, that is easilly detected and breads (and the pictures in it) disappear after a while. Re-upload on random other places.
Well i linked Q memes directly to disqus (news site forum)
And after a while they went into my history and deleted almost all