Advice needed - mosaic centrepiece in bedroom floor

Okay, so we're still going. We took a break after - disappointingly - not finishing for our Easter deadline. This was mainly due to work commitments for Roscoe, and house fatigue on my part!
But now I'm ready to press on for a few last weeks of hard labour before our first guests arrive. The main job is still plastering and tiling the remainder of the bottom bedroom, and of course the dreaded painting. The plastering is most of the way to done, thanks to some weekend work by Roscoe, and I'm preparing to lay into the tiling.
BUT, it's a very weird shaped room. I plan to do, as elsewhere, a border of the terracotta tiles, and the rest in herringbone layout. I also want to add a centrepiece of 30cm x 30cm mosaic (which I bought a while back). But where should a centrepiece go?
The obvious answer is "the centre", but in this room, I'm really not so sure, as it's got two zones. The physical centre doesn't feel very, er, central.
Design guides suggest lining a decorative piece up with the centre of a door. Great, that makes sense. But this room has two doors on opposite walls, and they aren't lined up. On the plan above I've drawn a central axis, and then an axis from the centre of one door to the other. Is this where the mosaic should go? Should it be straight to the long axis, or to the one between the doors?
About the room: it's very rustic (a euphemism for having no straight walls) and will be a twin bedroom for guests. It's about 5m x 2.5m (measurements in the drawing above). One of the doors comes from the hallway, and the other leads, via a metre-deep arch, to an external door. I don't expect the external door to be used often.
The photo shows the mosaic surrounded by some of the main tiles. Do let me know your opinions and past experience.