My Process

Thumbnails, Layout, Revisions, Revisions and more Revisions, Final Art.
I start by mapping the whole project  in small thumbnails. Once I have the 'map' completed, I start refining the sketches. There are lots of revisions, lots! But once I like the composition, I can move onto the fun part, painting! 
Picture
Thumbnail/Storyboard
Three Examples: Thumbnails to Final Sketch to Final Art