The correct answer is variety. Variety is the principle of art has lots of different shapes, colors, forms, textures which are done to make the entire work more interesting. Variety is a principle of design concerned with diversity or contrast. Diversification is achieved by using many different elements to enhance the interaction in a work of art.
Principle of arts refers to how an artist uses elements of techniques such as lines, color, form, shape, value, and texture to organize a work of art. Other principles of art include balance, rhythm, harmony, emphasis, gradation, and movement.
There are seven principles of art, and they are all vital to the composition and to make the piece stimulating and eye-catching to the person creating or viewing the finished product. The seven principles are pattern, balance, emphasis, contrast, harmony and unity, variety, and movement.
The value of diversity, which refers to the use of different visual elements will break up any monotony in the piece. You do have to be careful though; if there is too much variety, it can compromise the harmony and balance of the art.