Herons are ambush predators. I watched this one stalk the side of flooded quarry, wading out looking for fish, disappearing into the reeds hunting for nestlings and frogs. The threat was recognised. A pair of common terns mobbed it as it hunted.
These quick sketches were more about the vegetation than the bird (with its unnaturally long bill!). I sought to contrast the cool neutrals of the predator (ultramarine, burnt sienna and rose madder) with the cool greens of cobalt blue and aurolean. I still need to find those deep dark cool contrasting greens to define the foliage.