The one addendum I'd suggest would be something I've seen referred to as Cardboard Castle syndrome elsewhere on the internet, but I'm not sure if it's warranted. Several cows are completely defined by the concept though to the point where it outshines all their other forms of autistic behavior.
Cardboard Castle autists see someone do something (building a castle) and gaining respect and fame from it. They rationalize that if they do the same they'll receive a similar amount of praise, so they set out to do the thing on their own and eventually succeed to the extent that whatever they create is markedly and visibly inferior to the original. The autism comes from their complete and utter inability to differentiate quality between the original medium and their interpretation of it, to it to the point where they violently reject anything they can interpret as criticism ("Hey, is your castle made out of cardboard? It looks good!") and utter belief that they can do no wrong and their backwards, self-taught methods must be adequate and/or superior because they worked So Hard on them.
Andrew Dobson and YandereDev/EvaXephon are the two examples I can think of prominently.
The important differentiation here is that while artcows who make terrible art are common, they can change. Tim Buckley and Rob Liefeld for example have both taken criticism to heart and moved on to the point where their art is competent. Dobson now is indistinguishable from Dobson in 2013.
I added the Imitationist Autist, based on your suggestion.