Most buyers prefer a listing to load as quickly as possible. In general, you'll sell more if you concentrate on making the text quick to load and easy to read. As tempting as it may be to type all in all capital letters, don't. On the Internet, all capitals translate into yelling. Plus, text written all in capitals is difficult to read.
Photos are important.
Make the image as sharp as possible. If you have photo studio software, shrink the size. The image should be large enough to show detail but small enough so it loads quickly, usually fist-size or smaller. Include additional photos of close-ups, signatures, manufacturer marks, and so on. For more information, see eBay's photo tutorial .