
It's a nice little sketch, but it's notable for being the very first time I've sketched any Three Thieves characters for someone at a show. Yay!

Then, on a layer behind the line art, I do the flat colours. Everything is coloured its bright, fully-saturated daytime colour, regardless of the lighting in the scene. Of all the steps, this one is the most time-consuming:
Then I use a custom brush tool to digitally "paint" in a shadow layer, using a dominant background colour (in this case, grey):
Then I select everything that's not shadow, and fill it with the ambient light colour. In this case, the scene is lit by a torch, so the light is very orange/yellow. Playing with this layer's opacity allows me to decide just how strong the light is a given scene, especially in terms of how much it contrasts with the shadows:
Finally, a layer of highlights. In this case I used the yellow/orange of the torch but also some white, because I felt that with torchlight on gold, there was enough yellow in the scene and I wanted to break it up a bit. As a final touch, I turned the black line around the torch's flame into a yellow colour hold. You might need to click through to the larger version to really appreciate the differences in this one:
And we're done! Woo-hoo! Just another 111 pages to go!