I searched a guide book on butterflies and I feel quite certain that this is a female Papilio aegeus aegeus or Donovan Orchard Butterfly which is found throughout much of Queensland and other Australian states.
You may notice that the potplant contains a lime tree.
A while ago my husband was concerned about the grub like pests chewing on the leaves of my precious lime tree. Those pests have sinced metamorphosised into these beautiful delicate creatures.
Below is the male Papilio aegeus aegeus. He also seemed content to pose for this photo.