Collage, oil pastel, ink on paper.

I took a trip to Krabi in Thailand and was particularly struck by the beautiful rock formations in the Andaman sea. Known as karsts, they are geologically quite rare, made of limestone.
I took a snorkelling trip out to some of them and we swam in caves under the karsts and at night amid bioluminesce plankton. It was quite an experience.
Original is sold. Digital print available