http://Krita.org - In May 2011, the team behind Krita (the open source digital painting app) recorded a number of very different artists to show their workflows, how they use Krita's many tools and areas still up for improvement.
Animtim creates a full body character sketch, with inking layer blend modes, color and use of painting modes to add final shading. A great example of creating comic style illustrations step by step in Krita.