Georges Seurat painted many seascape and river scenes, using pointillism.
Look at the PowerPoint presentation below for examples.
Firstly sketch the image to be painted (Seurat often painted river and seascape.)
Then use cotton buds to dot paint onto the paper
This activity provides a good lesson in colour mixing.
Lighten and darken colours by using white and black paint.
Try to make the dots as close together as you can to allow the colours to mix.