The technique we recently used in Extended Drawing class, of using the wiped-away charcoal to make a companion drawing, seemed useful here. The "blank" paper was a bit of tracing paper with some rubbings on it, but never mind, those marks will add to the interest (or disappear) -
No, it's turned into a giant thimble in the jungle! -
And ... it's hardly a "void", nor is the idea for the edges developing. Next time...
I'm pleased about coming up with some new-to-me marks with some of my not-much-used materials.