I hear some negative comments about quilts by some who are picking it apart with their eyes. Why do people do that? I do butt in and say, Hey, this quilter has a quilt in a quilt show and I'm standing here looking at it! There is no negative about that.
I may not agree with the judges decision on some of the winning quilts but I keep my comments to myself.

most judges seem to like mitred corners

check rules of each show, they are all different so it pays to know the rules of the show before you start your project

You first need to find the information about the show. Some require a specific size of rod pocket. Some require a label be attached. Some required photos. Need to decided wisely what class is best for your quilt. I entered many shows. I NEVER pre-washed my fabric. Make sure your piecing is perfect along with the binding. You might want to enter a local quilt show or the county fair.

The idea of a photo is so important. Many shows required it with the entry form. You definitely want to keep a copy yourself.

A tip given at our guild is to study the entry categories closely and make sure your quilt is a good fit for the category in which you enter it.

A lot of good advice here. Have fun and enter your quilt in a show!