So I think I may have figured out why I'm having so much trouble getting the perspective right in the backgrounds for the December 17 strip. It's because I'm trying to match the layout of the tavern as shown in the first panel, but the perspective is wrong in that panel. The windows and tables are too low, so when I try to draw them from a different angle, either they're too low there, or they don't match the first panel. I guess hypothetically I could redraw that first panel, but if haven't redrawn any of the other early strips (except for particularly flagrant errors like backward hands), I'm not going to redraw this one. I'll just press on and stop being so much of a perfectionist (my art is after all very far from perfect regardless), and if the backgrounds don't look quite right, eh, neither does any of the other art, so whatever.