It was high time for a new tutorial - so here it is!
Technique: Digital colouring and painting
Programme: Photoshop 6 (graphics tablet recommended)
Techniques: Shading, lighting, creating custom brushes
Experience with digital media: Intermediate recommended. I don't explain the most basic of the basics in this one.
Please note: I still paint in Photoshop 6; a lot of things are probably different in newer versions, but most of what I explain here will (hopefully) go for more recent version too.
Disclaimer: This is not the only way to colour, it's probably not even the best way to colour, but it's the way I colour.
Finished image can be found here: [link]