This piece of aboriginal art was painted by Amy Gunawarri. To quote the literature that came with it: The story tells of a woman who was banished from her tribe and forced to live in the sea. Eventually she grew fins and scales on her body like a fish. She saved any of her tribe unfortunate enough to fall into the sea and unable to swim.
From what I remember learning about aboriginal spiritual beliefs, dreams are a glimpse into the after life. It's interesting to me that the artist chose the name Water-girl Dreaming. I imagine she had a deeper meaning in mind when she painted this story.
Here's my version: