I’m pretty sure I used the spoiler tag correctly. The image appears blurred, at least in my browser. Is that not what you mean? Here’s a screenshot of how it appears for me:
safe meaning no nudity, such as cropping the nude study to display head and shoulders
I’m a bit confused by this still. Are you saying that censoring the image isn’t enough to… censor it? I’ve never come across a rule like that, even on the most strict of all-ages platforms. Solid black bars cover nudity a lot more effectively than clothing, I’d say 
For example, is this image NSFW? How about this one? Or this one? Or this one or this one?
Each of the above images directly shows or suggests a lot more of the “naughty bits” than a black bar… right?
Not trying to argue with the rules, but… assuming I’m understanding you correctly, I truly just don’t understand this rule.
EDIT: To clarify, I’m saying that all the linked images above are most definitively “safe for work”. And furthermore, that fully-censored images show as much (or as little) skin as images of clothed models, and therefore are also safe for work