Janes used balance to express the coldness of the plot between Salome and Herodias. He made the two figures almost exact reflections of one another at 90 degrees. Everything lines up exactly between the two women – their eyebrows, their mouths, their hairlines, their necklines, their waists.
However, all the symmetry in the picture is between the two women. Everything else feels unbalanced and strange to suit the horrible story.
Janes was very interested in pattern. The textiles of the curtain and clothes have repeated shapes almost like mosaics. There are lots of patterns to find if you look very closely: