These are not Celtic, it's not likely the Celts wore anything like these, unless they got them in trade or took them off a dead guy. And if the conventional dating is correct, the Celts weren't yet in Europe; the Hallstatt culture is generally regarded as the classical era or "real" Celts. The Irish Book of Invasions records three prior layers of paint (as it were) in the British Isles. I watched a YT vid about Hallstatt culture princely tombs this morning sometime, can't remember the name, this may be similar -- Etruscan grave goods, Greek vase, along with other stuff acquired in trade, plus Celtic-worked gold items; there's a find from about mid-century, also in France I think, which had the largest surviving "vase".
Interesting. Will have to look for that
For some reason, youtube seems to think I’m a teenage consumer of Kardashian level pop culture.
Here’s the big krater, from the Vix burial in Burgundy, France — details shown in other photos include crested helmets. The archival photo used in the video I saw this morning showed a conservator working on the vase while *inside* the vase.
Celtic find in France leaves archaeologists baffled
https://www.thevintagenews.com/2016/10/14/celtic-find-in-france-leaves-archaeologists-baffled/