Taken from
this interview in 2019:
By which comics authors you feel most influenced? Who are your "signposts"?
Chronologically: Franquin, Hermann, Moebius, Bernie Wrightson, Neal Adams, Joe Kubert, Gil Kane, Alberto Breccia. There are others, of course, but these are the most important ones. My idols remain
Franquin and
Breccia.