Yep, it's happened to me.
While searching for more Cid Highwind art, there was a particular deviation of him that struck me as familiar. And no wonder. It was a pretty much a traced copy of him from 'Captain Vs Captain' but flipped horizontally and altered somewhat.
Check out the similarities here. The deviation in question is in the middle; my art is on either side of it.
I've already contacted the artist about this. I told them that it's fine if they want to copy or use the pose. But at the least, the decent thing to do would be to make reference to the original art.
Now out of respect to the artist whom I suspect is underage, I won't name names. But simply put, to all you art rippers out there: it's not on.
Do not think for a moment that you can get away with using skill and talent that is not your own.