hardly any chinese painters tried to depict falling rain drops ... and in japan the subject seems to have been avoided until hokusai showed up
zhang yucai, painted in the early 1300s ... beneficent rain ... plenty of cloud and lightning ... but the image is so dark it is hard to distinguish any marks that signify rain as a substance
https://www.metmuseum.org/art/collection/search/40454
dai jin, painted in the early 1400s ... clear broad swathes of rain depicted here in "returning home by boat in wind and rain" ...
hokusai 1817 ... from the seventh book of manga
hiroshige, 1834 ... sudden shower at shono
kuniyoshi, 1835 ... nichiren's prayer for rain answered
my question is ... DID CHINESE ARTISTS POSSIBLY/MAYBE HAVE A SUPERSTITIOUS OR THEOLOGICAL REASON TO AVOID THE SUBJECT OF FALLING RAIN ?
later ... much googling and some serendipity led me to jennifer purtles paper on "zoomorphology" ... i think she tells me much of what i wanted to know ...