Discuss the formal innovations of Song landscape painting

What will be an ideal response?

Song painters cast their own long shadow over the future with a focus on the landscape. The Song style of monumental landscape was largely the creation of Li Cheng. In his hands, the elements—mobile mid-air perspective, monochrome ink, vertical format, flowing water, shrouding mists, and a buildup of forms culminating in towering mountains—were gathered into a newly harmonious and spacious whole.