Instead of using carbon/graphite paper for these designs, I used a sheet of paper with a section coloured in using oil pastels. I did this because there were not many sheets of carbon/graphite paper available to use.
With the water splashes on the dolphin image, generally scribbling in the direction of the water seemed the best way to produce a good result while under the restriction of ‘one line’. Likewise with the bee, I used scribbles to provide the detail for the wings, but left the main body.