Thanks, Brian. Completely agree with you about the sign, but since it is there, I left it...
As for the bubble level, it does take practice but I find myself lining up shots instinctively now, without really thinking about it. I generally just use the sides of the camera frame as my straight edge and line up the subject accordingly. About half the time, I still need to make tiny adjustments later in PP, and that was the case here, too.