Gr. This is my third time writing this post.
A criticism I've received in SB's Fakemon competition is that my entry shows a distinct lack of technical skill, as it has no shading and some very rough linework. It's definitely a fair criticism, and one I look forward to correcting in future rounds. As I've said, I still have trouble with isolating linework and coloring, so I've compiled a few tutorials to help me.
Nastyjungle
I'm sure either me or LORDY has mentioned Nastyjungle before, she's a Smogon artist and a favorite of ours. She has a few other tutorials on her DA (~Nastyjungle), but I think this is her most complete and useful tutorial, though it is aimed at people with higher end drawing products (Ps, nice Wacoms,etc.)
Namh
In all honesty, I don't always love Namh's work. But if there's one thing I can say, dude (dudette?) knows how to color. Again, aimed at people with tablets and Photoshop, but a very clear, helpful guide.
Mr. Tou
A nice tutorial for scanned lines, done in Pse 8. Just found it today and haven't finished it, but it looks good so far.