4. Attach Ample Photos
You want take every opportunity in your postings to create credibility. Pictures are an ideal way to do this. That's why I use ALL FOUR pics available whenever I can in my posts. Pictures can make an item very real to a customer and give him some peace of mind that what he sees is what he will be getting. When I personally search for items to buy on Craigslist, whether or not I see the (pic) tag is a HUGE factor in whether I click on the posting or not. I want to see the item. So do your customers, and they will be more likely to buy if they have a good idea of what they are getting.
When I say use photos, I mean take pictures of your item. DO NOT use a picture of something that IS NOT your actual item. Example: You are selling a Compaq computer. Do not take a picture from BestBuy.com of that same Compaq computer and put it in your post. Use your computer in the pic. It really hints of a scam when I see otherwise. I don't know about you, but I get suspicious when someone does not show me the actual item. Are they afraid to show me what it really looks like? Is there something wrong with it? Broken or dented? Is it a different model than what is described?
Show the flaws - Not only take a picture of the item, but take pictures of it's flaws! If a key is missing off the keyboard, show it, or if there is a noticeable scratch or dent, show it! The reason for this is that it shows you are honest. And people will see and respond to it. It will get you repeat business as well. If you are honest with a customer, they will remember it and want to do business with you again.
Take another look at the Craigslist description for the Jeep. The photos are taken at a suspiciously far distance from the car.

Compare that to the photos in this next posting:

Which of the above would YOU consider buying?
Include yourself in the photos – Wherever possible, include yourself in the photos. This will go a long way in showing: 1. You are not afraid to show your identity, and therefore you have nothing to hide and 2. A more human element ro your posting. With all the scams out there, people more than ever want to feel safe and comfortable when purchasing something online or making deals online. Don't take a pic of just yourself, but try to have yourself in the pictures of your items somewhere. And example of what I am talking about is the pic of me with my Mac laptop on the web site where you bought this book.
Include a signature or logo - If you do not have enough views of the item that would warrant using four pictures, include as one of your pictures something that would serve as a logo or signature of you. And as many times as you can, use it in your postings. In doing this, people will start to learn who you are, and if you are trustworthy, you can expect to get return customers when they see your sig/logo.
Here's an example of what I mean by adding a signature or logo:

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