I think the Shipshewana show is juried, so try and submit good photos. The photos should show the entire quilt, preferably with no hands and feet (!), and not be skewed if you can manage it. They'll probably ask for a detail shot - I always try and make sure I pick a section that doesn't have cat hair or missed points and big stitches...If you don't have good photos, enter anyway! My husband shot pictures of one of my quilts lying on the floor, and it still got into a few shows.
The judges will look at how accurately you pieced the top, whether the quilting compliments the top, if the quilt hangs straight and flat, with square corners. Their comments will be helpful, not harsh.
The best part of entering a show is seeing your quilt hanging with the others. It's addictive!
Good luck.
Janet