Another reason why I don't color One Piece as regularly as other series is due to my laziness. XD It's easier to make lineart out of things like Naruto and Deadman Wonderland, and other series than One Piece.
I know that to well :D. In One Piece are to much details. One Thing i like in Naruto are the more Human like-drawn Charackters. In One Piece the Charas often look like Comic Figures.
but you go on with the Colorings ^^ they are far too good.