Paint your face in a pattern of a skull to show respect to the loss ones. Mostly like a religion or a mandatory tradition. The skull pattern is to resemble the dead loved ones as well as for other reasons like for celebrating purposes to set action.
Laying out offerings, sharing stories, and decorating gravesites are other known traditions. For lay out offerings that is like food, special activities, flowers, and a bunch more. With sharing stories that usually explain what happened or just off topic stories including from
scary, to happy, to sad. In decorating grave sites, it would be like laying flowers on the grave or tombstone to show respect.