The depiction of divine beings with Down Syndrome features isn't new. There are several examples in Gothic and Renaissance art of "typical angellic features" which have an uncanny resemblance to Down Syndrome features.
Reims cathedral has a statue that stands out in my mind.
http://www.owlnet.rice.edu/~hart205/Gothic/images/71.gif
There is also one at the met from France that seems to resemble the Reims example.
http://www.metmuseum.org/toah/images/h2/h2_1990.132.jpg
There are also the giant Olmec heads...
http://www.franklinco.k12.nc.us/ESL/lessons/mexicounit/Olmecheadblackwhite.jpg
http://www.esg.montana.edu/esg/kla/bigolmec.jpg