What is the primary purpose of the drybrush technique in painting?

The primary purpose of the drybrush technique in painting is to add texture and contrast in a painting. This technique involves using a brush that is relatively dry, with only a small amount of paint on it, allowing for a controlled and nuanced application. As the brush is dragged across the surface, it catches on the texture of the canvas or painting surface, creating a layered effect that enhances the visual interest and depth of the artwork. This method is particularly effective for creating highlights, depicting rough surfaces, or adding emphasis to certain areas in a composition.

The other choices propose alternatives that do not fully capture the essence of the drybrush technique. For example, applying a thick layer of paint would suggest a different technique focused on impasto or glazing, which aims for a glossy finish and smooth surface. Creating a smooth and even wash of color is characteristic of techniques like watercolor or traditional brush techniques with more fluid paint, rather than the textured results of drybrush. Lastly, executing detailed and fine line work typically involves finer brushwork and possibly different tools altogether, focusing on precision rather than the broader textural outcomes facilitated by the drybrush technique.