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That's an even better reason to use very simple faces. The more simple the faces, the easier it to see them when they're far away from the camera.
Well faces with "line" mouth and "dot/line" eyes CAN look nice too(example for dot/line eyes - CaitSith - dot on moogle, line on cat), I would see best making his lips a simple line but increasing it's size, and also increasing the size of his eyes, just increase without simplifing them.
For some refference just type "chibi smile" in google graphics, simple line looks really nice for them. Much better than actual lips.
LOL that's maybe not exactly what I mean(too kitty-style), but it's damn funny xD :
Oh and I really always thought that Zidane and Garnet or whatever they were called from ff9 were like 9yo kids while I seen cloud about 17 or something like that;P, well I'm probably wrong at both, but my memory for dates sucks and I don't really remember their ages.=]
Image Macros have a place. And that place is Completely Unrelated. User was warned for this post^Explanation:
In my opinion it was related, I inserted an image to show that smile made out of just a "line" looks good at Chibi version. Sure it's not exactly same character, nor exactly same style of smile which I noted above. I just linked it from google graphic find, it's not mine so I didn't edited any of it respecting unknown author. Sorry if I was wrong. >.>