What is the most suitable height and width for hanging pictures on the wall?

The height of the wall is generally about two and a half meters, and the length is generally about three meters. The lower edge of the hanging calligraphy and painting should be parallel or slightly lower than the horizontal line of sight after standing. If there is a sofa under the calligraphy and painting, the length of the calligraphy and painting should be about two thirds of the length of the sofa, and the height of the calligraphy and painting should be about one third of its length. If you choose overall calligraphy and painting, the area of landscape calligraphy and painting should account for about 40% of the wall area, and calligraphy works or abstract paintings should account for about 30% of the wall area.