The National Quilting Associatiion website has lots of information on judging criteria.
http://nqaquilts.org/judges/judges-about.php
http://nqaquilts.org/judges/judges-faq.php
Although local shows (quild, county fair, 4-H, etc) may differ slightly, it can't hurt to aim high. Most show committees will let you know in advance what the quilts will be judged on and if you Google
quilt judging criteria, you will find a wealth of additiiional information online.