Artworks should be displayed away from direct sunlight and breeze. To clean accumulated dust from a painting, use a soft, dry brush very lightly on the surface.
Make sure there is no moisture on the bristles before touching the artwork. For repairing more severe damage, such as cracks or discolouration, it is best to seek help from a professional. Once a year, remove the artwork from the wall for a couple of days to let the wall breathe and avoid moisture accumulation.