Esoteric buddhism art was influenced by polytheistic religions. what was the main characteristic of esoteric buddhism art?

I believe the correct answer is: Mandara.

     East Asian Esoteric Buddhism, founded in the early 9th century (Heian period) and referred to as mikkyō (secret teaching) in Japan, was influenced by polytheistic religions, from which the main characteristic was mandara/mandala. Mandara is the way of spiritually and ritually representing the universe through chart or geometric pattern.