Concept art of Grand King Ghidorah’s dome from Rebirth of Mothra 3 (pictures from Toho Kingdom).
Bakura and Spectreman
Kanegon cutaway postcard
International, US, and French posters for Space Amoeba (1970), also known as Yog, Monster from Space.
"Battyl" by Gary J. Smith shows an original creature inspired by the antagonists of tokusatsu dramas such as the Super Sentai series. It combines elements of a crab, a rhinoceros beetle, and a poisonous amphibian to great effect.
Here’s my piece for the Tokusatsu show at Q-Pop Shop! If you’re in LA this weekend, you should check it out! qpopshop.com/main/?page_id=17
Drawing by Chris McD of the monster from Gwoemul a.k.a. The Host.