To suggest the modelling of undulating landscapes and the structural form of objects such as cottages, fences and woodland, additional colour needs to be applied to the basic pale wash under-painting.

These additions can be employed with discretion on wet or damp paper for soft edging or bone dry paper for hard edged areas. Superimposing or overlaying by implication means laying a colour wash over a colour dry or damp area to deepen the intensity of the same colour or to create a different colour to represent shadows, textured walls and a few finishing details on dry paper. Care must be taken to prevent muddy colours caused by too much over-painting. Two or three colours overpainted at the most.

Experience colour behaviour under varying conditions. A pale all-over wash or a part glaze over-painting can harmonise well and unify. If the colours are not well chosen they could just as easily result in muddiness and loss of luminosity. It is also predictable that wet colour will burst into a drier area. Alternatively a thicker consistency colour brushed into wetter colour will give a soft shadowy appearance. This is advantageous to represent masses of foliage, misty silhouettes in distance or out-of-focus grasses in the foreground.