To create an image that is not harmonious, the best choice would be:
C. change all organic shapes to geometric shapes to create a cubist portrait.
This approach introduces a level of abstraction and fragmentation that can disrupt the typical harmony found in more representational art forms. Cubism often leads to a disjointed, chaotic feel, which can effectively create a lack of harmony in the artwork.
Options A and B could also disrupt harmony, but they might still retain some sense of cohesion. Option D, while it may not create a traditionally harmonious image, focuses more on enhancing the overall composition rather than disrupting it.