Version names should help you understand what changed, not simply tell you which file was saved last. A small naming system makes collaboration and later review much easier.
Name the decision in the filename
Include the video project, version number, and a brief distinguishing feature such as close-up or no-text. Avoid files named final, final-new, and final-really-new. Keep the editable source separate from the exported image used for publishing.
Change one main idea at a time
When comparing alternatives, make their differences understandable. One version might test a tighter crop, another a simpler label. If every element changes at once, it is difficult to describe what you are choosing even before any performance data exists.
Save a comparison sheet
Place the candidate images at the same size with their proposed titles. Review them under the same conditions. A polished export should not win simply because another version was shown larger or without its title. Write a short reason for the selected version.
Record the published asset
Keep a note of the exact file used and when it changed. If you later review analytics, this prevents confusion about which cover viewers saw during a particular period. A version log cannot prove causality, but it can keep your observations grounded in the actual publishing timeline.