I've collected 11 examples of advanced redrawing done by Urakai Scans into a swipe file.
The examples are not perfect, but they can give valuable clues to the beginner on how redrawing is done for a HQ piece.
01-07 Gintama cleaned by _V0iD_
08-09 Gintama cleaned by spades
10-11 Kekkaishi / Riki-Oh double page cleaned by Silver Sea