That's a very pretty watercolor!I keep most of my finished pieces (paper) in one of those 12" x 12" plastic cases that are made for scrapbookers. I have two of them that are filled plus some larger pieces in a portfolio.
I save a few practice pieces, but most are cut up and used for atc's or mixed media projects. Some are simply tossed because they need to be. Lovely to catch up with you again!