Elements of Art:
Line
Line is the visualization of a path that a point (or the viewers focus) can move upon.
Shape
Shape is the 2D representation of contour or geometry of an object within the image. In the case of this image the negative shape inside the coffee cans creates the shape of a rectangle.
Color
Color is an images chromatic quality. Typically this is seen thematically as shown above with the clear brown scheme despite the presence of other colors.
Value
Value is an objects quality of brightness and darkness within the image.
Form
Form is an objects perception of 3D depth within an image.
Texture
Texture is an objects perception of having a tactile quality within the image.
Space
Space is the use and understanding of negative space as an object within an image.
Principles of Design:
Balance
Balance is the symmetry of objects within the image.
Contrast
Contrast is the arrangement of objects within the image to create a difference and draw attention to the imbalance within the image.
Emphasis
Emphasis is the use of difference to draw attention to an object of importance within the image.
Movement
Movement is the inference of motion of objects within an image.
Pattern
Pattern is a uniform repetition of objects within an image.
Proportion
Proportion is the use of scale between objects within an image.
Alignment (Repetition)
Alignment/Repetition is the uniform arrangement of objects within an image to form a line.
Unity
Unity is the concept that all objects within the image have a sense of belonging or possessing a central theme within an image.