One was a collage of photos of Kali Uchis (all clothed, seeing as the alternative does not seem to exist in the public realm), one was a painting of three (clothed) Greek women, and one was a painting of Job (with a cloth draped over him).
That aside, several similarly innocuous reblogs were censored, the most absurd being a view of the horizon at sunset from an airplane.
Never mind the ethical issues associated with censorship and the assorted adverse consequences for tumblr as a community, automated image recognition is nowhere close to mature enough for use on an industrial scale, and tumblr's management is causing far more harm than good in what it's doing - both to its users and itself.
Ironically, hobbyists on 4chan have done a better job of image recognition (which they use to identify body parts in order to de-censor pictures) than whoever the hell tumblr is paying to implement theirs.
They're not paying anyone, they're using an open-source neural network lmao. ---