It is good Netiquette to include pictures with every post. Don’t post items without pictures.
Photo Netiquette Classifieds
Classified advertising posts with pictures sell faster. They sell for higher price than items without pictures. Pictures give a potential customer an idea of what to expect. Knowing what an item looks like makes the transaction smoother. The buyer and seller are on the same page about how an item looks before they ever meet.
Consumers buy what they can see. A good picture that matches an item is a great seller. Many people have been disappointed by items that do not match their pictures. Some sellers post stock photographs of items. That is an indicator of potential problems.
Include pictures because it shows us what to expect.