Personally I thought your pic looked best before you changed the color of the lineart- but I suppose it's more realistic your way since as in life we are not surrounded by a black line. Tutorial was awesome though.
I really loved your tutorial and I've trying to use the same style in one of my works but I am stuck with something... well, when I do the second step (new layer, mask and fill with black) it only fills the mask bit in black and only around the line art, not inside. And the layer part still stays in white. so when I do the third step "colouring" it colours over the line art. do you change the layer to "darker" or something? then, when I try to do the last step (paint over the line) its doesn't work either... I'm so confused with this, but i really want to use it ...