The Classifieds FAQ is basic:
http://www.triumphrat.net/faq.php?faq=classifieds
Also see the notice on the classifieds entry page.
When I check new ads, my first step is to see if it has a thumbnail image. If it doesn't, then I remove it. If there are images elsewhere in the ad, that is Ok, but all submissions that are "For Sale" need to include uploaded images.
Ads are free to TriumphRat.Net Users, but I have yet to update the notification text that refers to "for a fee" ads; which haven't yet been implemented.
You are free to re-post your ad, but upload some pics of what you are selling with the submission.
Hope this helps.