When using the photo uploader, clear your cache and temporary Internet files. Software like firewalls, ad blockers, and web accelerators can sometimes cause issues.
When you create your listing, be as descriptive as possible. Write an effective title and description, list your item in the right category, use product details (if they're offered), and fill out all item specifics suggested for your item.
You can make your listing stand out with listing upgrades such as a larger photo.