why same ming and qing?

I take their stances, the way they lean, as a sign that those bows are fairly strong.
The positioning of their feet is not quite the same, and it also seems as if the Ming are leaning forward a bit more than the Qing, if you look at the head of the former picture and assume that the string is pulled up to touch the side of the face and arrow underneath chin.
Slightly difficult to tell how much more differs, since the Ming is painted more simplified.

Jiao; this is actually an ancient archery stance. It is shown in Indian Archery, p 236, called Asamapada, if I have it correct, and is listed in the Indian Danurveda as one of the eight recommended stances which an archer should learn. There are also two inverses; to switch legs (very difficult). The other is to shift one's weight in the original stance to the rear leg by standing erect with chest out.

My group is practicing all 8 stances with very informative results.

Try Samapada; stand facing the target with heels touching and feet spread. Now shoot. (rather difficult) -j-

jack farrell

can you post the picture of Indian Archery, p 236, called Asamapada and My group is practicing all 8 stances with very informative results