Ask someone to start something for you to finish.
For the "illusion" to work, you have to imagine this Cercropia moth is actually Mothra (and perhaps you're about to become the latest casualty). It's like when you "squish" someone's head between your fingers (but everyone loves Mothra, so no squishing).
AC supplied me with this lovely sketch of hands that she had done and told me to put a bug on it.
I printed it out from her scanned copy.
I then drew this moth separately.
A light box was used to combine the drawings and I finished it with colored pencils.