Aschenbecher mit Skeletten

We can see four skulls at the center of this brazier that tries to pass out for an ashtray,lying at the hands of the struggling trio.
These three skeletons are probably trying to bring their long lost brother back from another world in which he was trapped.Two of them have an angered determination,while the face of the third is different,almost devoid of life.
The artist could have made all three of them identical but chose not to and the minor details speak for themselves.Brilliant!