My only advice is to make it clear that any questions and request for more pics are welcome. difference between barely making reserve and thousands over is more pics of underside and the offer of quick replies to any questions or pic requests.
Include a pic of scratch you mention. straighten horn button, and front wheels. as is look's like car needs an alignment and steering wheel isn't aligned properly.
Your ad is real nice and I'm being hypercritical.
Good luck. I wish I had the cash to buy at your generous reserve and flip it.