Curvy Horns and Lunar Portals for Downward Flow
See also my previous post https://www.facebook.com/share/p/1GdWyMvcrC/ The halo around the angel head is the portal, the horn is its attribute marker, and the opposite polarity is the fire (an upward flow symbol) on images A,B,C,E and F.
Image D is not clear to me, but knowing about the curvy horn helps a little.
When legs straddle the edge of a well, or partially rest on an animal, I think that indicates two polarities (like straight and curved leg), but I'm just not sure on image D.
https://ca.pinterest.com/stevenbhalls/straddling/ Image I would have an upward polarity bird on the hand, but it's beak looks curved, so that confuses me.
Image G might be a central flow person-symbol doing leg straddling, but again, I'm not sure.
But that horn is clearly used as a symbol and not a literal sound-maker.