All the elements of the painting have to be mentally
handled at the same time, with regard to tone,
composition, shape, form and colour, etc. Because you are not waiting
for paint to dry, which allows you thinking time, you need to know your
materials and techniques well before you start.
You can just plan the painting in your mind but doing a sketch or drawing before starting the work can be very helpful.
In the landscape painting above, the canvas was first covered with a very thin layer of Zest-it Clear painting medium.
Sky and water were painted in first, followed by the background hills and land to the left.
The trees on the right were added using a stippling action and the boulders at the front were painted in using a knife.