I take photos throughout the process, so I can see the quilt more clearly - for me, at least, it seems that when I take a photo, I don't see the mistakes and other things that leap out at me. I see the whole quilt, which allows me to check colors, and how it will "present" when finished.
I probably end up snapping at least two dozen photos of my quilts in various stages of production. It really lets me knowif I'm on the right track ...