First, an artist takes a clear canvas. Slightly draws the sketch of his future painting with pencil or charcoal.
Now, he puts the paint right over the sketch into the areas of each color, carefully and precisely without crossing the boundaries.
At this point, the main effort is to produce strong placement and gesture of shapes and volumes. An artist can achieve this by experimenting with gray and white paint.
When the underpainting has dried thoroughly, artists should develop colors relationships. They can modify color intensity by wiping them down with a rag or a clean brush.
If an artist wants to show the transparency of some objects, paint dense background with a rag or clean brush as the base for them. Then applies watery paint in small strokes over this base.
If a painting needs refining, glazing (putting a thin, oily, transparent layer of paint over the top of nontransparent passage) is an extremely useful technique for an artist. For example, it may help to lower the brightness of some fragment.
Artists use different densities of the same color to make form defining better. Note that diluted surface of the background contrasts with the denser surface of the object, so the object looks sharper.
Do you know that oil painting allows the artist to completely paint over and completely cover other paint layers as long as they are dry? An artist starts out with thinner layers of paint in lighter colors. Then slowly makes his way toward thicker layers and darker colors.