2. Item quality
To be honest, it really comes down to common sense. When first starting off on eBay, I suggest on relying on their customer feedback (being a power seller on eBay is a positive sign).
Another thing you can judge an item on can be picture quality, now the most pedantic person can make mistakes in their listings. For myself, I really judge by the brand that I am searching for. One of my most treasured items came from the most dodgiest of photos I ever saw on eBay.
Well this is done by knowing your brands and knowing your size, your real size. Shoes for myself are hard and I know my ring size is a 7. Many sellers do offer measurements as well, so don't be shy to ask them if they are not listed. Know your measurements people!
More eBay information will be dispersed later on.