BEWARE!! One thing about watercolors (some, not all, ask at your local artstore) is that they can fade DRAMATICALLY and very quickly. I had some that were in direct sun fade A LOT in just one day. Ask at your art store for the \'colorfastness\' rating. There is a number on each tube that indicates how it holds up in light.
Hate to see you go to a bunch of work and have it simply go \'poof\'.