1966 plymouth valiant signet convertible
make a photo bucket album-- or a similar site that holds pictures-- load up a nice selection of angles views of this car,(what do want to see as a potential buyer) then post that link to this ad---
your one picture provided is going to be a hard sell, since this is the internet & most people do not know you, take some time to make a nice sale ad & you will have better luck & most questions can be answered by viewing your photos.
Most likely your photos are too large & need re-sized to work on this site.
Good luck with your sale ,Lawrence