When posting pictures of your items make sure they are not only crisp and clear but use at least 2 full shots of the item. Display them in 2 different ways and at different angles. Then do 3 pictures of the item in close-up shots at different angles. Use a different background for some of the pictures to give it some variety, but make sure that your background doesn't take away from the item itself.
Once you have your pictures uploaded and you finish your listing, immediately check and make sure that your items 1st picture looks good in gallery format. The gallery format is what is used for treasuries and we all know that treasuries make the front page.
A little tip, but photos are the key to sales :)