Pictures are blurry. Try to take clearer pictures. Also, sell the cards individually. You will get more credits for them. If your home is smoke and pet free, let bidders know. If someone does something nice, like bidding generously, then throw in a little extra like another card.
Also make sure your seller/buyer reputation always remains high. Fan as many people as you can and earn as many badges as you can. All of this shows you can be trusted. Always supply your address on winnings as soon as possible. Leave feedback every time.