Answer:

-Proportion refers to the dimensions of a composition and relationships between height, width and depth. ... Proportion also describes how the sizes of different parts of a piece of art or design relate to each other

-Harmony in art overall is achieved when the elements of an artwork come together in a unified way. Certain element can be repeated, yet they still look and feel like they are lending themselves to a whole. Harmony is definitely not monotony but also not chaos.

-Rhythm provides a path for the viewer's eye to follow in an artwork. Lines, shapes, color, brushstrokes, light, and space help the artist create this visual tempo. ... Rhythm refers to the movement within a piece of art that helps the eye travel through the to a point of focus.