I took important parts from wiki about The Celts and their art. I tried to parts that would influence the 3rd painting I’m doing.
The Celts ( /ˈkɛlts/ or /ˈsɛlts/, see pronunciation of Celtic) were a diverse group of tribal societies in Iron Age and Roman-era Europe who spoke Celtic languages.
During the later Iron Age the Gauls generally wore long-sleeved shirts or tunics and long trousers (called braccae by the Romans). Clothes were made of wool or linen, with some silk being used by the rich. Cloaks were worn in the winter.
Principal sites in Roman Britain, with indication of the Celtic tribes. Tribal warfare appears to have been a regular feature of Celtic societies. While epic literature depicts this as more of a sport focused on raids and hunting rather than organised territorial conquest, the historical record is more of tribes using warfare to exert political control and harass rivals, for economic advantage, and in some instances to conquer territory.
Celts had a reputation as head hunters. According to Paul Jacobsthal, “Amongst the Celts the human head was venerated above all else, since the head was to the Celt the soul, centre of the emotions as well as of life itself, a symbol of divinity and of the powers of the other-world.”
Like all Iron Age tribal societies, the Celts practised a polytheistic religion. Many Celtic gods are known from texts and inscriptions from the Roman period. Rites and sacrifices were carried out by priests known as druids. The Celts did not see their gods as having human shapes until late in the Iron Age. Celtic shrines were situated in remote areas such as hilltops, groves, and lakes.