I have found some more images of the Swat Bowl, North-west India, 5th-6th century. Possibly of Huna or Kidarite cavalry: Two horse-archers hunting and two horsemen with sword or spear, wearing crowns similar to the last Kidarite coins
Note the apparently deformed skull, similar deformation can be seen on the Coins of Khingila, Alchon king, 5th century AD and earlier on the Armour Bearer, Khaltchayan Reception Hall, Yuezhi north Bactria, 50 BC-50 AD
The pair of hairy objects on the rumps of two horses are plumes. They can be seen on a Sasanian Cameo of Shapur I vanquishing Emperor Valerian, 260 AD, details of their attachment can be seen on The "Stroganov Plate" (or Freer Shapur plate) with a Sasanian King hunting boar, Iran, 4th century AD. These plumes can be seen as late as the 7th century A.D on the "Sackler Plate" with a Sasanian King Hunting Ibex. Similar plumes with flat rather than pointed end can be seen on a Sasanian plate of Shapur II hunting, fourth century AD and later on a Sasanian (or Umayyad) Horseman on a stucco panel, ca. 6th–7th century A.D.

Druzhina
Plates with figures from Persia and Central Asia

Thanks D.

Seconded.

Cheers - Phil