"The Willow Landscape" by Clark Ashton Smith

Sung dynasty: in Chinese history you have the Northern Song (960-1127) and Southern Song (1127-1279) dynasties, which can be romanized to Sung instead of Song, most notably in the older Wade-Giles style that was in widespread use in the 19th century. There's also a Liu Song dynasty (420-479 AD). There is, however, no dynasty referred to in an unqualified manner as Song or Sung.

Now as it so happens, I have had reason to learn the basics of Mandarin Chinese in my life, so my pronunciations should be tolerably close. However, the text provides no explicit intonations, and my skill at Chinese is not good enough to know what they should be, and I'm not going to go looking it up since it isn't likely to be obvious when it comes to people's names in any event. Regardless, I was never very good with the intonations and even if I knew which ones to use, I probably wouldn't do a good job with them anyways :-P

Shou Shan, the Taoist Paradise: I'm a bit confused on this, as Kunlun is the Taoist mountain paradise (Shan = mountain). I can't find any reliable reference on what Shou Shan is. As it happens, Shou in Wade-Giles is also Shou in Hanyu, so it's not a difference in the romanization. So I have no idea. If you know Taoist lore better than I, please leave a comment below regarding Shou Shan!

morbidezza: an extreme delicacy and softness; a sensual delicacy of flesh-coloring in painting

mere: lake or pond

Mandarin: in this context, an official in any of the nine top grades of the former imperial Chinese civil service

The picture used is a Chinese painting that has willow trees, a lake or pond, a bridge, and a building. No woman on the bridge, no misty mountains in the distance, so we'll just have to fancy this is a detailed zoom-in of a portion of a larger canvas.

To follow along: http://www.eldritchdark.com/writings/short-stories/246/the-willow-landscape

From everything I have come to know of Chinese culture and traditions and history, this story does feel quite authentic. There's nothing in it that stands out to me as noticeably wrong or bad or improbable. Good job, Mr. Smith, good job.

Well, if I really wanted to be super picky, I never saw or heard of a bamboo bridge, or a bridge of anything other than stone or metal. A bamboo bridge would surely just be temporary while a more permanent bridge was being built near by? So there's that. But that's a level of nitpick of a detail that is not even slightly important to the story.