This pose was too hard to prompt for me so I decided to teach Pony what I really want. Trained for SFW and NSFW. It also allows to prompt a certain dangling pose you may find in the example images with a happy elf.
Main Tags (you may want to use some of them in the negative to avoid a certain view, e.g. looking through own legs):
downward dog
upside-down, looking through own legs
Support tags you may want to use:
bent over, top down bottom up, all fours
Perspectives:
from side, profile
from behind
front view, straight-on
from below
Framing:
full body
feet out of frame
hands out of frame
Other:
facing away
holding legs
hanging
tiptoes
legs apart / spread legs
legs together