Hi Jill, that is a very good observing about the AI auto focus. I am also surprised now that this setting was on the camera on that moment. Could be really influencing the focus at the moment of shutter close. But still. My question: is the red house not sharp enough at 100% ?
Hello,
I also do not think that focus is an issue, it seems sharp enough to me. You also have a good depth of field. I also think that AI Servo will not make a difference in focusing, even if on a tripod. There is no sign of camera shake or focusing problems.
As this is a night, the colour balance is influenced by artificial light; my suggestion is to correct your white balance. Take out the yellow/magenta cast, and you should be fine.
E.g
Using auto colour

And while you're making changes, crop out the lower part.