I really don't think that's traced, just copied. He didn't literally draw overtop of the original material.
The Sonic cartoon has a lot of beautifully simple shapes, and there's really no
trace of them in Chris' artwork. Below is a really good example of this, and it's a really fascinating plunge in how Chris' mind processes/digests visual information. Sonic's spherical body is warped into a triangular abomination, the dynamic upwards tilted head of Sonic is stretched into a vacant blue blob, and so on. If he had simply traced over the artwork, these basic shapes would have persisted into Chris' own art; however, because it's copied, you can see how Chris' brain twists and distorts the information presented on screen - to paper.
It's like there's a very small bank of information floating around in Chris' brain, there's no room for anything so complex as a circular body or a rounder head. Sure, the basic pose still exists, but has been completely reinterpreted through Chris' broken mind. All nuance completely lost in visual translation.
It's fascinating, really, and it's a great illustration of how he re-interprets the world around him.
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