Combine watercolour and acrylic techniques. Work dark to light or other way round. Washes and detail.
all about edges. Can work back in.
use mediums and then wash out. Print with kitchen towel and other surfaces. Lift off and blot out. Sgraffito.
texture and transfer effects.
See also post Jonathon Leyton Vera
Good look at sketching with gouache and making little gesture studies. Uses dry brush scumbling.