
Wei Dynasty camel (northern China, 500-550 AD) (Musee Guimet, Paris)
It was in the time of the Three Kingdoms that the first artists appear whose names we still know today. One of the earliest Chinese artists whose name we know is Ku K’ai-chih, who lived in the 300s AD (when Constantine was first building Constantinople in West Asia).

Wei Dynasty (northern China, 504 AD), Buddha going up to Heaven (Musee Guimet, Paris)
Ku K’ai-chih is said to have been a great portrait artist – he painted pictures of people. But nothing he painted has survived for us to look at today.

Caves of a Thousand Buddhas near Dunhuang, 400s AD – Buddha and his boddhisatvas

Royal couple on an elephant, 500s AD (possibly a Buddhist scene) (from Musee Guimet, Paris)

Wei Dynasty (northern China) armored horse, 400-600 AD, in painted clay (Musee Guimet, Paris)
What about Sui Dynasty art?
Bibliography and further reading about Three Kingdoms Chinese art:
Art in China (Oxford History of Art Series), by Craig Clunas (1997). Not specifically , but a good introduction to the spirit of Chinese art. Warning: this one is not arranged in chronological order. Instead, it has chapters on sculpture, calligraphy, and so on.
China: Dawn Of A Golden Age (200-750 AD), by James Watt and Prudence Harper (coming soon – fall 2004). This is the catalogue from an exhibit at the Metropolitan Museum of Art in New York City – it has great pictures and also a detailed discussion of the art of this period.