Color of the water on f79v as an indicator of religious cleanliness

[Not_A_Corncob]

Notice how she is standing upright, holding a cross.

Below her is a woman lounging on her back, wearing some kind of head covering and some kind of wring, bracelet or shackle.
[..]

Is she really holding the (only) cross?
No. This gesture is more a refusing or putting away that cross.

For comparison: the next figure clearly holds a kind of ring - the draftsman was not unable to draw a hand in a holding position. He just didn‘t it for the first person and the cross.

So that may not be some message of Christianity, but right the opposite.

This is a really interesting thought.

Taken from that angle, it could represent someone's fall from grace. She rejects the cross, gives in to idleness and vanity, finds herself in a tight spot and ultimate gets down in the muck.

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Are your eyes uncrossed now, or did I make it worse?

I love the detail you put into your reply! I admittedly do not totally follow your logic here, but I love the idea of the tubes representing rivers. Are there other examples from the area and time period where this sort of symbolism is used?