I wound up raising the ceiling and opening up the area where the icon statue sits. In addition, the walls are all curves of one type or another.
I added some sweeping structural elements to the ceiling to relate to some of the sweeping lines of the exterior. I also raised the ceiling of the main audience chamber and added a small lofted section to complete the transition.
For the bedroom, I took out the original simplified Roman columns and added the sweeping organic struts to the interior. That changed where I could put the sconces I had already constructed, so I had to come up with a different idea.
Overall, the design feels better. It feels less "cardboard box" and more vessel-like. I have a few more design details to add, but the idea is to make this feel like a luxury yacht. Surfaces have to hide the functional elements of the craft while still conforming to the design of the surrounding elements.
I did a few more sketches of things I still need to add and added some glow to give some sense of where the light sources will be coming from.
I hope to finish doing the modeling this next week. My plans for the plants is to modify some XFrog plants I've downloaded for free and make them feel a little more alien, either in texture or shape. We'll see how it pans out.