• Use your title line intelligently. 
• Read a few similar eBay listings before you post yours.
• Listing items that other sellers have currently listed and that are not selling is not good business.
• List items in the correct categories.
• When writing a description, give complete information in a logical order.
• Spell words correctly.
• If you post more than one photo, put your most informative photo first.
• Assume bidders are in a hurry.
• Avoid animation.
• Avoid large, slow loading graphics. 
• Avoid color backgrounds.
• Avoid music.
• Avoid describing something as "awesome" or "rare."
• Consider other avenues for selling before you put it up for sale on eBay.

via artbusiness