https://www.theguardian.com/world/2021/sep/03/its-exactly-like-a-puzzle-experts-on-piecing-together-roman-fresco-find
From the "House of the Harpist" in Arles, C1 BC.
Edit: Aaargh, I meant "fresco"!
Thank you, very interesting. Hopefully describing the house as 70-50BC, with a working life of 20 years, but also describing it as "late Pompeii era" was the fault of the journalist.
Proves that this bit of Gaul was very well advanced on the gentrification path of Romanisation. Also, if it really only had a life of twenty years, the rate of change in either fashion or conspicuous wealth was very high. Which one might suspect in the late republic, but interesting to have potentially hard evidence.