Once the paint has dried and you have not previously done it,
pencil in the shapes of your picture.
I am using a dark-coloured crayon for this purpose.
Please, do not use wax- or water-soluble pencil colours.

Do not overdo the number of objects in your painting.
Go through the experience of why you are painting
before losing yourself in the arduous task.

Next, you need a glass filled with water and a rag.
Squeeze rather more than less titanium white (acrylic) onto your palette.

Now, pick up some paint with a bristle brush and brush it on
so that the lines of your drawing have served their purpose and
show through the lightened and not whitened areas.
New brushes should be cleaned with water and dried with a rag.
Start with a somewhat larger area of your painting and become
familiar with laying in washes. Use your brush in small rotating
movements until all paint has been released.
You will notice that this process may well achieve gradation and cloudy texture. The painting acquires depth and three-dimensional quality.
Here again, be careful not to create raised surfaces.
This could prove to be a disadvantage at a later stage.
Before picking up new paint, briefly dip the brush in water
and dry it with a rag. Do not dilute the white with water.
The brush is still sufficiently wet.
If in your painting you figure for example, a yellow or blue sphere,
they may look alike for the start. In this instance you merely work
to create light and dark. Do not touch the dark areas, highlight
the lighter ones. This is highlighting lights.
The respective light or dark shade will be added later.