heh it's nice ^^ i've used this technique a long time ago ^^
I think you just need to blur the black borders (i dunno the term on english, i hope i've said it good) of the drawing for a better rendering... btw it's perfect ^^
Ooh ^^ I take it you're testing "soft shades" instead of the usual cell shading. :3
You might want to watch out for the typical white line, that occur, between the line art, and colors (for example the dark blue pants). I can try to explain how to avoid getting that line, in case it's something you want to get rid of X3
But while in Photoshop, you have you drawing scanned and ready.
Then make a new layer on top of the layer that has the line art.
You can add colors n the new layer without getting that white line to appear.
When you add colors like this, it looks like you are covering up your lines with your coloring. BUT set the layer blending mode, where is says [normal], to [multiply], that will make the color layer blend with your line art, and that way you won't get the white line, between your line-art and colors ^^
As for the rest, it's all about practice, but doing good! :3 keep it up!
Well I must say that you seem to be quick at mastering this new coloring technique or what you with call it. It certainly doesn't look like something I could do any better.
Only think I can put my paw on would be that the line art needs a little work, but I too still have problems with that as well.
Anyways, keep up the good work.