Coloured sketch of Mothra; not much was changed honestly, although I retroactively ended up changing the wings in the final designs to be rounded instead of pointed to further differentiate them from her eventual male counterpart. The body also got a lot bulkier so that it would seem more plausible she could fight physically as well as with long-range attacks.
In case you're curious, the choice of a six-winged design in part comes from the long-extinct palaeodictyopteran insects of the Palaeozoic and in part from the mythical seraphim.