Dwayne Biddix‘s tutorial deals with the very start of a illustration. He showcases the thumbnail process, to study the composition before actually committing to it.
But the tutorial doesn’t stop there! Dwayne takes you by your hand and runs through his own process to create a top notch piece. Notice how he tries to create a story with the composition, or at least convey action.
If you like Dwaynes tutorial, consider checking out more of his work here.