A listing has two audiences: eBay's search engine and the person scrolling results. Win the first to get seen, win the second to get paid.
Clear, bright, multiple angles. Don't use images with watermarks or text overlays that aren't yours. Use the product photos you have rights to use.
Fill in every attribute eBay offers: brand, model, color, size, material, UPC. These feed eBay's filters, and listings missing them get filtered out of results buyers narrowed by.
Set a handling time you can meet even on a bad day. A short promise you miss is worse than a slightly longer promise you keep. Handling time vs delivery estimate explains the difference.
Synked helps here: listing creation pulls the Amazon details, maps item specifics and drafts the title and description so you review instead of retyping.