It is much more reasonable still to have a thumbnail that represents the image, rather than the current fad of peekaboo here's-an-armpit here's-a-big-toe jumble.  The only guarantee under the new policy is that you will consistently NOT have a thumbnail that represents a nude image, so why bother investing effort to make it cutesy?  It still won't do it's job.  No, it doesn't particularly depend on the image to me.  Maybe for you, but that's you.  /shrug

PS:  I'd go on to say why I'm not very fond of the cropped head thumbnail trend but what I have to say there is rather unkind, so I'll refrain.

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