How to make a happy face?

This artwork was done during the SARS period of 2003 in Hong Kong when everyone were afraid of the contagious disease and are wearing face masks all the time. Their nose, mouth, and smile are gone. I tried many different compositions on the mask within two months period and finally discovered this image to be very effective to cheer people up. Not only the nose and mouth is back, everybody who saw my mask starts to smile again beneath their masks.