I use gouache to create my illustrations. My process involves applying an opaque area of gouache on board then removing it with a wet brush to create the details. This negative painting method creates some wonderful textures and energy.
More info: Instagram
Rhino
Gouache on board
Peacock
Gouache on board
Arthur
Gouache on board
Mystery Man
Gouache on board
Mystery Man
Gouache on board
Chet
Gouache on board
Wally
Gouache on board