@Tom R.
I’ll provide some constructive feedback.
FIRST - Never, ever, ever, ever, expect to touch something up.
Does it happen, yes. But the odds are never working in your favor. For perfect touch up, you need to use the same exact paint, apply with the same exact applicator, in the exact same weather conditions and relative humidity.
Light colors touch up better than dark colors.
Use as little paint as possible, and thin it with water 5-10%.
Never touch up a wall that was painted with a roller, with a brush. You’ll have different textures that will make even the perfect match stand out.
To save yourself headaches, simply paint from corner to corner. Instead of $3, if you would have spent say $12 on a gallon, and painted corner to corner, you’d spend probably an extra 30 minutes and $9, but surely you would have been much more satisfied with the outcome.
