The artwork for the continuation of the series Blueberry was done before 1985 .
The original Blueberry series has spun off a prequel series called Young Blueberry , but the artwork was left to Colin Wilson and later : fr : Michel Blanc-Dumont after the first three original volumes in that series , as well as the by Giraud written , but by William Vance penciled intermezzo series called Marshal Blueberry .
Jean Giraud