If you loved Picnic at Hanging Rock, try Master and Commander: The Far Side of the World
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Picnic at Hanging Rock
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Master and Commander: The Far Side of the World
What they share
Both films are directed by Peter Weir, and they sit in Drama territory. If that's the register that drew you to Picnic at Hanging Rock, the second film will land in a comparable space — through a different lens.
What Master and Commander: The Far Side of the World is
You command a British warship in treacherous waters and then a French vessel attacks. The captain's relentless pursuit is matched by the surgeon's concern for the crew. The film is set during the Napoleonic Wars.