>>7205557In his most famous appearance and most of his creation, he was always protrayed as being smooth with tendrils popping up everywhere. The black parts was to show that the symbiote was constantly in motion, but like it was underneath a glass. It's akin to Rorschach's mask, but chaotic.
This was done to show how unstable he was.
Can't blame someone for wanting Carnage to look like his most popular storyline and game.