Adding the right picture is the best way to encourage potential buyers to look at your item.
When you submit an item, you can upload a minimum of 3 pictures of your item. Don't forget: the more pictures your item has, the more attractive your ad will be. Always add a picture of proof of purchase and /or authenticity certificate whenever you have one.
Try to follow these general guidelines when you take a picture:
Take a picture of the entire item
Use a good light source
Take it from different angles to show all sides
For shoes always take a picture of the sole
Show all the defaults your item has, as described in your add
Your pictures must be in .jpg format to be uploaded. They can be taken with any good resolution smartphone.