Snoopy's head is one of the most problematic entities, artistically, in Peanuts. From the side it's great, but from a three-quarters perspective it is weird. His cheeks round out a bit, to give his mouth more room for expression.
It's still less of a cheat, in my opinion, than late-era Snoopy, which rounded out his head in profile but is more problematic in terms of eye and mouth placement. (Of course, there's no law against cheating, especially if most people never notice the cheat!)
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