Ok, I can see some pretty harsh comments from ignorant Americans;
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what the hell is that a crease on Sonic's head? And what's with Amy's hair in all these comics. I know that they based it off that Sonic CD artwork but damn wasn't there any other art of Amy they looked at that told them "Oh shit we aren't doing it right." Fuck they could have looked at sprites and got a better interpretation
The artists didn't for the most part base the style on the sprites, they based it on promotional material at the time and if you cast your mind back to the god-aweful low poly renderings of Sonic 3d that was the most up-to-date sonic artwork available. Don't forget this was 1996, there wasnt really an internet, the writers got most of their art from sega themselves. As for Amy, for the first few comics she DID look like her Sonic CD version, but, a new editor (Deborah Tate) wanted to expand the comics fan base to girls so she ordered Amy to be much tougher and have a stronger female lead. I hope that helps.
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I feel that the physical proportions given to Sonic and the rest of the cast look awkward and ungainly. Sonic's body being almost the same size as his head, along with really small hands and shoes. It doesn't look sleek, and it doesn't even look cute. Tails had a big forehead, which is a characteristic which helps make a character look cute and childlike, and then he ended up having old man wrinkles above his small eyes. Other characters like Johnny and Porker look outright strange when you compare their evened out, human-like proportions to those of the established characters. Odder still was that things like hands, clothes and other smaller individual details that made up the characters look well drawn. Maybe the artists didn't know how to draw cartoony stuff very well. Compositions within the panels (again, only from what I've seen), look very cluttered most of the time. Colors are alright.
Artist interpretations kthnxbai, Sonic wasn't supposed to be cute, he was a sarcastic, bitter, reluctant hero who got cast into the future by one of his best freinds (forced by Robotnik) where his arch nemesis ruled, killed and enslaved his home zone. Oh and he also created Robotnik to save the world from Metallixes, and his Super side was a sadistic murderer. Hardly cute.
As for tails, well, as I said it wasnt really a 'cute' universe.