BALANCE -     concerned with arranging elements so no one part of a work overpowers, of seems heavier than, any other part. Parts of a picture may be SYMMETRICAL where half of the design is a mirror image of the other half, or ASYMMETRICAL, where neither half of the design is identical but seem to carry equal weight, and RADIAL - when elements of objects in an art work are positioned around a central point.

VARIETY - the difference found in a work of art when you combine one or more elements to create interest by adding slight changes.

HARMONY - blending elements to create a more calm, restful appearance.

EMPHASIS - a focal point in a work which the artist has used to attract the viewer's attention
.
PROPORTION - the size relationship of the parts to the whole and to one another.

MOVEMENT - a rhythmic flow in a painting or sculpture that leads the eye across a single plane
or between planes in space.

RHYTHM - repeating of elements to make a work seem active or to suggest vibration.
 

UNITY IN ART - when all the elements within the media create a feeling of completeness, wholeness.  When it all comes together.