Even if you looked it up, like I did it wouldn't change much. When I read - no where did it say "color it like you dont want it to look like". Also if you see something, even if you dont understand it, you can comment on it as much as you want (I bet more then 80% of the items sitting next to you right now you can't explain
fully, including the how to use, how to make, and how its derivatives are formed - yet you probably have made a comment about all of them Like "windows sux, or rox").
I dont know a thing about making movies, I'd probably make one of the worst movies ever - but that doesnt mean I cant say a movie was really bad, the camera work was horrible, ect ect.
You can do a 180 in the process, but it isn't expected - and you would even less expect someone to do it on purpose (not that the whole of shiva is a 180 but changing her from a humanoid likeness to freezy ice is a big change in color scheme).
A lack of knowledge in the subject matter did affect the conversation, but it is indeed a perfectly good excuse. Now if only the side that didnt know just commented on the model and not so much on the colors and the people that did know stop acting like everyone is such a damn noob and should be ashamed (not everyone fits either category, like there are many who took back some of their comments after learning more and some that just kept on making pictures and teaching).
"No its not an excuse" I hope you can follow this (going to make it corny

):
Aliens come to earth and will let the world live if you can shoot a soda can 100 feet away the first time. However, never shooting a gun before you fail and the world dies. Your ignorance cost the world its life. IT is however not expected you could have done it because you didnt know how, therefore it is a perfectly valid excuse.
So two fold - you dont need to know everything in order to talk about it, and ignorance -can- be an excuse.