bathing illustrations and ritual purification

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MarcoP,

I wouldn't discount your idea, because obviously I have no way of knowing what's really going on here, but just to present an alternative, since you ask for them in your last post:

It could be an image relating to ophtalmology. See the pose in these images (sorry, found on google, no idea where these are originally from):


The instrument being held by the recipient also could be a kind of surgical implement, such as the one n the upper right here:


Again, sorry because I have no source for this set either, it's a Pinterest image labeled as "surgical set of tools 15th century" ... 
Having a very lazy weekend here