Drawing on my Sketch-Up Printouts

Now that I have created very basic 3D models for each of my design principles, I have now as part of the project, I have tried to experiment with different views within each model in order to find a view that I like that I can print-out and draw on each of them respectively. 

I have done very basic and rough drawings in order to inspire some more ideas to progress with when developing my models in the future. They are as follows:

Symmetry
*Possibly add spikes?

Rhythm
*Make it like a jigsaw puzzle, visual association - key

Proportion
*More experimentation needed

Figure-Ground
*To be honest, I don't know what this is haha

Hierarchy
*Repetition and work with scale. Possible add elements as well

Contrast
*Like above, repeat and work with scale and orientation

Datum
*Try and work out how to make spherical - this will increase the professionalism and aesthetic appeal