"Truth is never pure and rarely simple."
The mandala originally named "Sunflower" from earlier this week has officially morphed into the funkier Disco Mandala. And yes, you can re-Title Your Art because... it's your art. I usually don't change names unless it's a fairly new piece only because it creates confusion in my naming conventions.
I've just started using the awesome STACKS feature in Apple Aperture, which allows you to basically make digital stacks of similar photos ad hoc. No folders, tags, necessary, just drag and drop. It helps me keep photos of work in progress together - i.e. the art journal background with the finished page. They usually look sooooo different and I often work on stuff weeks or months apart so this will make documentation easier. And I love documentation.