Stage 4: I've finished roughly painting in the muddy lumps in the middle-distance and have started to add some colour and form to the wet sand just infront of these. It is important at this stage to establish the correct colour values for the wet sand as these colours will be carried through to the rest of the painting to a large extent. Some of the pinky-purple underpainting will show through in places which will help to emphasise the cooler blues and purples that make the sand look wet.