Just sayin' don't agree. I think it's an amazing rendition of a character - especially being able to see the eye expression. It's not like Vader where the eyes are masked - the audience needs to respond to a face. And not somewhere at the back of their minds dismiss the character for looking like a cartoon. As for the color - IMO that's an ugly shade of reddish purple, but maybe it's supposed to be.
Quick test:
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Real fire background and a more "classic" purple IMO is pretty distracting....
![Horror :horror :horror](/styles/default/xenforo/smilies/old/horror.gif)
You can darken it, lighten it etc. but it's still purple vs. what the trailer shows. Like grape Koolaid which isn't going to be taken seriously.
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IMO a true purple works in a space setting with lots of dark and cool colored backgrounds. The light is different. It may be that it'll be in space we see a more purple Thanos.
*Shrug* Don't think the Russos are afraid of color or Thanos' helmet etc. but am sure the decisions they are making are based on lots of screen tests - what works, what doesn't. For a character who needs to be a real ruthless badass. It's not like Hulk and Gamora are flaming kelly green in the films either.