I love all of your art and have never thought that any of your lighting looked entirely implausible. The woman in the crown could have deeper shadows on the left side (her right) if you're representing one light source. The other two heads do an excellent job of representing multiple light sources.

I imagine that non-dive tourist boats are even less regulated somehow, as there isn't even an international dive agency to answer to.

That seems wise. "A March 2024 Maritime Survey International report found that none of the inspected Red Sea dive boats had a planned maintenance system, safety management system, or stability books, concluding that the industry "plies its trade largely unregulated"."

I'M MOVED IN ENOUGH THAT THERE ARE NO BOXES IN THE BEDROOM!