Two questions, then a real number.

Nothing is assumed yet. Each answer adds the lines it pays for.

• A hero built for the thumbnailLegible at the size search actually renders it
• All seven gallery slots filledAmazon displays seven; most sellers stop at four
• The main benefit shown, not describedA feature infographic instead of a bullet point
• Dimensions and scale on the pageThe single most common cause of returns
• A comparison against the alternativesAnswers the objection before the reviews do
• The product in useWhere it lives and who it's for
• A person in frameScale you can trust without reading a number
• A+ content below the foldNeeds Brand Registry first
• Title, bullets and description written for searchThe words that decide whether any of this gets seen

This counts what the build above will contain — not a predicted change in sales, and not a score for your current listing. Anyone quoting you a percentage before the work exists is guessing.

This figure only covers what you've answered so far — it moves as you go.