Redrawing textures in double the resolution while staying true to the art style is hard, and I'm sure everyone who's tried making anything for Compliance knows this. Nonetheless, it's time to tackle all the problems you might encounter while texturing.
Here are some basic rules and guidelines to help you!
1. Outlines, dividing lines and the like that would end up being 2px when upscaled should always* be 1px.