So, I went with your advice, HawkDawg, and copied the bathtub I'd had in the level 1 bathroom. I did however end up taking some floor space from the two closets on the other side as well as a bit of rearranging, but I think it turned out alright.

I took this picture from the corner near the bathroom door, angled slightly down, trying to get in as much of what's going on in the room as possible. The only thing I'm not all that happy about is the fact that there's this open space at the foot of the bathtub.

I'm thinking of some possible changes to the room though...