This is one of the 23 delegations (satrapies) shown bringing offerings to the King during the New Year (Nou Rutz) festival.
The bas relief of each delegation provides valuable insight into the clothes and gifts from each region at that time.

The Elamite delegation are shown 6th from the left (2nd from the right), on the top tier of the Apadana stairway.
The Elamites lived in Elam which is in modern day Khuzistân around Susa and Southern Iran. They are most well known for the cuneiform script - the earliest known form of writing.

They are represented by 4 members, and bring a lioness with 2 cubs, bows and daggers.

The original bas relief is shown in one of the photographs (with low tonal range due to the shade).
The other photographs have been digitally enhanced by blurring the background in order to reveal their otherwise hidden beauty. I hope you find them as fascinating as I do.

For Elamite sites see Shush and Choqa Zanbil.