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Less is more. Scooter, to me, seems built similarly to both Fraggles and to half the Whatnots ever made. Take a roundish-headed Whatnot. Now imagine a line going up from lip to top of head, and slant his face off left and right of that centerline, like a paper fold but at a gentler angle, not sharp. Increase the round top of his head a bit, you've got it too small in area.
Best I can advise is to get a bunch of pics of him and try tracing a few to start with, then move on to freehanding. Also check out the Muppet Show Comic Books...there's a lot of very simple-line art in those which is amazingly effective at conveying the shape and the personality of each character!
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