At atpollard's suggestion, I have angled the profile of the aftcastle, which I think greatly enhances the overall look of the ship, even if it is hard to effectively furnish a trapezoidal room!

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One thing I want to comment on -- I really like the glow effect around the lanterns, although I dislike how I accomplished it. It's two layers: The top layer is the solid yellow circles that are the lanterns themselves; the bottom layer I used a large brush with the same color, then adjusted the hue of the layer to lessen the yellow and reduced it to about 60% opacity.

This gives a nice effect I think, but it's really awkward when I have to move or readjust any of the lanterns. Is there a better way to accomplish this (I'm using Gimp)?