Karen, one of the ladies in my quild was a judge in a recient show last month, and she said they look for color combo, points matching, straight lines in piecing and quilting (such as borders) and workmanship is a biggie! They go over the quilts with shall I say a fine tooth comb.
Hope this helps.
With this in mind, I am going to try to enter one in a show in Feb. I need to make it 1st tho. LOL