Opuntia callais commonly known as the Turquoise Prickly Stone Cactus

This species is found in the Stoney Desert which you can only reach after a long walk through the Stone Forest.

Opuntia callais commonly called the Turquoise Prickly Stone Cactus, is so named due to its rich green-blue hues though some individuals also sport areas of a coral orange. 

Process

Step 1: First layer of watercolor.

Step 2: Second layer of watercolor.

Step 3: "Possum Patty Lithification Process" using black Sharpie Ultra-fine pen.

Step 4: Watercolor background and highlights using Ph Martin's Bleed Proof White Ink and an old dippy pen.

Strathmore 400 Series Wirebound Watercolor Art Journal

Dirty watercolor palettes.