Grace Millane was backpacking in New Zealand when she was killed last week.
She was a keen painter, posting her artwork on an Instagram page called Art By Millane.
The 22-year-old was on her OE, and had spent two weeks already in the country before going missing.
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And it's her last post on the art page that has caught the attention of hundreds - a watercolour image of a skull with the caption: "Two can keep a secret, if one of them is dead."
The quotation comes from popular television show Pretty Little Liars, a show about the murder of a young girl.
The image was posted on October 23.
Other paintings pictured on the account include brightly-coloured animals and faces in ink and watercolour paint.
Ms Millane's murder-accused appeared in court on Monday morning after her body was found by police on Sunday.