Gouache is a beautiful, pigment rich and lightfast yet delicate medium - it can be reactivated any time, so please do not expose the surface to water as the paint will dissolve, even though it has been fixed. The painting is sold without glass, so take great care in not making the surface come into contact with objects that might scratch it. You can dust it down, if you ever need to, with a big soft brush or feathers. Also, avoid hanging this picture in an environment that is either humid or where the temperature changes rapidly (e.g. directly above a radiator) to avoid the wood warping etc.