I flood filled the background with pale grey, and on a new layer, sketched this out loosely with a small, hard-edged round brush using black.
Now I created a new layer between the background and the black lines, and used a larger brush to colour the character in mid blue.
With that done, I created a new layer between the blue layer and the lines, and painted in shadows with a darker shade of blue and a soft-edged brush on a low opacity.
I repeated the last step, albeit this time using a lighter shade of blue to give highlights. Et voila!
What about you? Have you ever used a graphics tablet, and if so, did you find it difficult to get used to?