Surely, ancient cultures took from each other’s.
Coins are circulating from a hand to another, maybe it was used to send a message of independence especially human images were religiously un-liked at that time.
(That is also my personal opinion )
The idea if disliking the human images on coin was " glory is only for god ", they thought human images would give the ruler kind of – not like everybody man- or god ( on the ancient way of thinking ) . Even it iwas not meant that way.
That is why it was hated, and Abdul Al Malik stopped issuing that
type.