Why paintings are built in layers, from underpainting to glaze

A typical sequence

Most paintings go through four to six stages:

1. Underpainting. A thin, often single-color layer that sets the composition and the lights and darks.
2. Shadows. The darkest areas are established first, because light is easier to add than to take away.
3. Mid tones and form. The body of the painting: the forms are modeled and the colors laid in.
4. Detail. Edges, textures, highlights, the things the eye goes to first.
5. Glazing. Thin, transparent layers that deepen color and pull the painting together.
6. Varnish. A protective layer that also evens out the sheen.

What the underpainting does

The underpainting is the plan. It fixes where everything goes and how light moves across the picture. Skip it, and colors tend to float, forms look flat and the painter spends the rest of the time correcting instead of building.

What glazing adds

A glaze is a thin, transparent veil of color over a dry layer. Light passes through it, reflects off the paint beneath and comes back richer. It's how a painter makes a shadow feel deep rather than just dark, and how a whole painting gets a unified tone.

Can you see the difference?

Side by side, yes. A painting with fewer layers looks flatter and more direct. A layered painting has depth in its darks, variety in its edges and a surface that keeps rewarding a closer look. That depth is also what no print underneath could imitate.