Pattern refers to the repetition of an element. (may be a repeated motif)

Rhythm is a visual beat.  Rhythm may be regular, alternating or random.

Movement in an artwork is to give the feeling of motion and to guide the viewer's eyes throughout the artwork.

Proportion is the size relationship of parts to a whole and to one another.  (like eye to face)
Scale refers to relating size to a constant, such as a human body.

Balance is the impression of equilibrium in a pictorial or sculptural composition. (often referred to as symmetrical, asymmetrical, or radial)

Unity is achieved when the components of a work of art are perceived as harmonious, giving the work a sense of completion.  Everything works together.

Contrast refers to the arrangement of opposite elements (light vs. dark colors, rough vs. smooth textures, large vs. small shapes, etc.)

Emphasis refers to the created center of interest, the place in an artwork where your eye first lands.