First comes the rough sketch. This was on my site for a few days, you may have seen it if you were especially assiduous in checking for updates.
This is a cleaned up version of the sketch I had here before. I repositioned them slightly to focus more of the attention on Lupin.
Next I draw the layout, on a piece of paper overtop the characters so I can see where they are – that way I can make sure the layout focuses the attention where it needs to go.
Then I paint the layout; now it is a background.
Finally I colour the characters to fit the colour scheme of the scene, and make sure that they belong. I add the lighting to match the lighting in the BG (background), and to help the characters pop out a bit. Then I plop the characters on the background, and tadaa! A finished piece!
Prisoner of Azkaban | The Azkaban Project