What I have in mind is some sort of rough textile and gritty layered finish.

Some inspiration

Source: https://mymodernmet.com/nature-textile-art-ana-teresa-barboza/

https://www.iloboyou.com/textile-art-ana-teresa-barboza/

Megan Shimek

Source: https://wildcountryfinearts.com/coral-textile-artists/

Edith Schaar

Mariadela Araujo

Lighting