Composition in painting involves the arrangement of elements to create a visually appealing and cohesive image.

Form is not an element of composition, as it refers to the three-dimensional representation of an object.

Unity in composition refers to the arrangement of elements in a way that creates a sense of cohesion and completeness.

Contrast in composition refers to the use of opposing elements, such as light and dark, large and small, or rough and smooth, to create visual interest and emphasis.

Emphasis in composition refers to the use of a dominant element or focal point to draw the viewer's attention and create a sense of visual hierarchy.

Linear perspective in painting refers to the use of lines to create the illusion of depth and recession, making objects appear closer or farther away.

Atmospheric perspective in painting refers to the use of color to create the illusion of depth and atmosphere, making objects appear more distant and hazy as they recede into the background.

Value perspective in painting refers to the use of light and dark values to create the illusion of depth and form, making objects appear more solid and three-dimensional.

One-point perspective is not a type of perspective used in painting, as it refers to a specific technique used in drawing to create the illusion of depth.

The vanishing point in a painting is the point where all parallel lines converge, creating the illusion of depth and recession.

The horizon line in a painting is the line that separates the sky from the land or sea, creating a sense of depth and perspective.

The foreground in a painting is the area that is closest to the viewer, typically containing the most detail and emphasis.

The middle ground in a painting is the area between the foreground and the background, providing a transition between the two.

The background in a painting is the area that is farthest from the viewer, typically providing context and setting for the main subject.

Balance is not a principle of composition in painting, as it refers to the distribution of weight and visual elements in a design.