contrast - the state of being strikingly different from something else, typically something in juxtaposition or close association.

emphasis - special importance, value, or prominence given to something. 

balance - an even distribution of weight enabling something or someone to remain upright and steady

proportion - comparative relations between things or magnitudes as to size, quantity, and number, etc.

perspective - the art of drawing solid objects on a two-dimensional surface as to give the right impression of their height, width, depth, and position in relation to each other when viewed  from a particular point.