I had finished the top of a Christmas quilt and had a friend in my quilting group hold it up so I could take a picture of it. Everyone in the group saw the quilt and commented on it. It wasn't until I was looking at the pic a couple of days later that I realized that I had sewn a row on upside down! I was glad I had seen it before pinning the layers together! Without the picture, it would have gone unnoticed!
Donna