Name the single changed variable
When comparing two exploratory passes, write down the one setting, artwork choice, or preparation step that changed. If several things moved at once, the comparison may still be useful, but it should be labelled as a broader exploration.
Preserve the reference alongside the note
Keep the image, file revision, and a short observation together. That makes it easier to return to the sample without turning an isolated outcome into a material guarantee. Browse /updates/ for more sample-review prompts.