At the Angoulême Spirou Expo, they have a “draw your own Spirou” activity, and some of the entries have been posted to Spirou.com. I was particularly impressed by this one, by Clément S., age 8 (really?!).
That’s a pretty sophisticated grasp of cartoon sketching for an eight-year old! You should go check out the gallery for more examples (many of the artists are older than 8).