Just the plasterwork gets interesting in places. The male figures look more like Neptune or a genii than anything from Christian mythology.
In some cases, the answer is clearly nothing,
as in these little birds that form part of the frame for a larger piece.
In other cases, the paintings clearly depict some biblical story or another, although sometimes in surreal ways. I think the dragon-like creature on the left is actually a camel.
I simply liked this one, with its impressionistic pastoral landscape and tiny group of travelers in the foreground.
There are all sorts of things ath are odd about this set of paintings. First there's the framing by armless, legless, shirtless, winged women. Then there's the figures with legs narrowed to sticks (found even more dramatically in other places in the Vatican). Then there's the Saint Nicholas-like figure labeled Solomon.
We've gotten used to the dragons in the Vatican, but the woman wearing a shirt that specifically does not cover her breasts is pretty risque.
And from the decor just below this painting we see a similar theme, with one woman with only her breasts uncovered and the other entirely naked, although the absence of legs makes that a bit less revealing that it might be otherwise.