What a great idea. Wish I'd thought of it. Yes, I have picture albums all over my computer for various sites where I display my work, but I never thought about some of these tips.
A picture accompanied with the description of the work, the materials used, when it was made, if sold, who it was sold to etc. etc. Click on the title to read the original blog post in "Beading Daily" by Jean Campbell.
Printing these out can be expensive, but if you need to carry it with you to show potential buyers it's well worth the extra time and money.
If not you can store it on your computer and still have it readily available. You can have one for items for sale, items sold, UFO's etc. and even one with sketches and plans for future projects.
I'm not much of a planner. I get an idea in my head and "doodle" until the beads go where I want them to, then make a pattern, but sorting and storing pictures of work is definitely something I need to try.