Most web searches on Manchurian archery inevitably take you to the Mongols and Mongolia.
This link will stick to the subject at hand : www.chinese-swords-guide.com/chinese-archery.html
The main thing to notice is the length of the feathers relative to the length of the arrows. The feathers can be a foot long or more (!) In this photo, the feathers start behind the halfway point of the arrows length, but some Manchurian archers had them placed starting at the arrow's center point.
Excellent close photos of the arrows and a description of the feather sources are seen upon scrolling down at the above link.
The old 3-D version of the above image is seen here : www.flickr.com/photos/24443965@N08/3515058690/
A similar photo is also seen at the first archery link above, and the 3-D view confirms the slightly bent knees, and the forward lean of the upper body.
I am not an archery expert (including total ignorance of where Cupid gets his equipment), and wonder how many other "archery cultures" take this slight squat and bend position in their formal stance.
Photo by HERBERT PONTING in 1902 for the stereoview publishing company of C.H. Graves.
All of the ARCHERY views on my photostream can be seen here on one page : www.flickr.com/search/?w=24443965@N08&q=aRCHERY&m...