I spent some time yesterday and this morning adding some details to drawing on each of the index cards.
I added stippling and lines to add shading on the focal points, both in black and white.
I also added some ground for them so they weren’t floating in air; the grasses or plants in the background I wanted as black silhouettes just so interest/texture/pattern was added.
Finally, I added either white dots or black ‘popping bubbles’ to the ‘sky’ for more visual interest.
I’m now much happier with them and feel that they are complete.