This series was wonderful. The 03 saga will always be my favorite it took a lot of deconstruction and also did it's best to give the digimon partners unique personalities rather than extensions of their partners. It's a series that SCREAMS for fanfiction to fill in the blanks.
I'm still kind of working on a predictable colouring method. I tend to lay down some basic colours on a layer below the lines (which I set to multiply) and then I experiment with the selective colour and curves options for colour adjustment.
I also use the layers palette to paste in textures and/or copies of the main image. I just set the new layer to soft light/overlay/multiply/etc., then I adjust the opacity and sometimes run a blur filter and I just see what works. It's a bit random