Are ancient murals thick or thin?

During the Sui and Tang Dynasties, Buddhism flourished. At the same time, the new painting styles and themes introduced from the western regions have enriched the content of murals in the Central Plains. Since Wei, Jin, Yuan and Ming Dynasties, the composition forms of grotto murals have their own styles and characteristics. The diamond-shaped composition of the murals at the top of the Qizil Grottoes in Xinjiang is a major feature, and each diamond is painted with the story or fable of the Buddha himself.