Any ideas about this detail? (Middle right rosette).

[CaryR]

But there is a way to interpret this Rosette that may be you and Cary see as fitting in to your approach.

Michelle, this is an interesting perspective, I had not considered this rosette being a view of a bowl or vessel with contents as seen from above. And I think such a perspective is possible and that other parts of the imagery may include views of things as seen from above. 

However, I do want to be careful not to run away with the Revelation approach and start trying to link all parts of the Rosettes to Revelation imagery-- because even if it is the case that parts of Revelation are referenced, the intention may not be to include all parts.