Balance- Similar to balance in physics.

Color- Also called Hue.

Line- The linar marks made with a pen or brush or the edge created when 2 shapes meet.

Contrast- Opposite colors on the color wheel 

Direction- Horizontal, vertical or oblique.

Dominance- Gives a painting interest, counteracting confusion and monotony.

Gradation- Of color from warm to cool and tone from dark to light will cause the eye to move along a shape.

Harmony- Visually satisfying effect of combining similar, related elements.

Repetition- With variation is interesting, without it repetition can be monotonous.

Shape- A shape is a self contained defined area of geometric or organic form.

Size- Size is simply the relationship of the area occupied by one shape to that of another. 

Texture- Surface quality of a shape, rough, smooth, hard, glassy, etc.

Value- The lightness or darkness of a color. 

Unity- Relaxing the design elements to the idea being expressed in a painting reinforces the principal of unity.