At the moment we have 3 max bumps which also include a photo as in these rules:
(17) Continuous 'bumping' of threads to promote your sale without good reason, will result in closed threads and infractions. Please edit your last reply in the thread rather than 'bump' with a new one, this includes adding images directly under one of your own comments, bumping by proxy or discussion and to a maximum of THREE BUMPS in total.
After the 1st post which opens up the FS/FT thread, can the 2nd post be reserved for larger photos? Buyers always want a bigger picture of the small one (which is in the main post) so they can see more detail etc. By reserving the 2nd post for example naming it "PFP" Post for Photo, this gives the sellers a better way of selling their items and not so restrained on the rules which are imposed already.
Even if there was a tab which could be clicked on at the side, this would then allow the seller to upload the photo(s) would make it pretty cool :)
This would give the seller still their 3 max bumps and having been able to present their FS/FT item in a better way