Congrats on your first movie
And
Yes! A vast difference in size between heroine and villain or villainess is extremely enticing.
A large or towering opponent thrashing a petite Supergirl type character would be excellent!
Have you considered looking to the wrestling world to locate huge imposing villains and villainesses adeptly skilled in trouncing smaller combatants.
If they desire anonymity because of the genre, it's as simple as acquiring a mask to keep them incognito.
These two female wrestlers from RingDivas would be outstanding in costume, it would be magnificent if you could obtain either of them.
Sandy Van Buren as Supergirl
Gojirah as the tormenting massive villainess
Sandy Van Buren vs. Gojirah
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Subsequent to Supergirls demolishing the aforementioned whipping scene, once she's dragged to an adjacent room and strung up to the rafters AOH, would be tremendous!