I am by no means an expert. I have only entered 2 quilts in a juried/judged show. I think it varies from show to show, there is no one universal standard. Judges will offer constructive advice so don't worry, they won't be acting all quilt police on you. They do want to see intersections that match up and points are not chopped or cut off. For binding they like for the mitered corner to be sewn shut. Here are comments I got on one of my quilts, Green Fairy (my Longarm quilter) and I won 3rd place ribbon with it.
What an explosion of color and value
Chevron border effectively frames the action
Generally very good piecing technique. Some unsecured seams and chopped points noted
Generally good quilting technique, tails should be trimmed
Quilting designs are effectively placed
Bindings are secure however edges should run straight
Here is a link a picture of the quilt that these comments refer to:
http://www.quiltingboard.com/picture...a-t160708.html
Good luck and have fun! It is always so exciting to see your own quilt hanging up in a show.