How to calculate the specific price of wall painting?

The larger the painting area, the lower the price per square meter. Generally, you don't need to print 8~ 10 square meter to submit the whole painting. The more complicated the drawings, the higher the price per square meter. Generally, painters, Chinese paintings and meticulous Chinese paintings of the same material type are more expensive than freehand Chinese paintings, realistic oil paintings are more expensive than abstract oil paintings, and 3d murals are relatively more professional and the price will be higher.