The following pages shows a typical process taken to complete an image in the digital form, from sketch. Below is a comparison image, that can be slide from side to side to see the way the digital art matches the sketch created firstly.
Below that is the animated gif of the entire process, to show how the steps are built up over time. This image of Edgar Allan Poe took only 4 hours (though they can take unto 10 to complete). The process, after base colour always focuses on getting the eyes right first and then typically moving down the head.