11 January 2011 - Comic #375

"Merry Christmas and Happy New Year 2011 !

(Currently in Casemate)"

Apparently, when Tarrin was 14, he sent a letter with the drawings and caricatures you see above to Franquin and actually got a reply. Franquin took the time to mark the parts he liked and didn't like and also gave him some advice (on the page with Gaston's face).

Original post: Les conseils de Franquin

14 June 2007 - Comic #122

In case you don't understand the reference: Tarrin's Spirou et Fantasio is said to bear a close resemblance to the drawing style of Belgian comics artist André Franquin who worked on the series from 1947 to 1969. 

Original post: Slurp !