I've never really made a tutorial, I work on these in so many small bursts that it hasn't really been easy to document the process. Even with access to a layered .psd file, I usually have to re-draw certain aspects and merge lighting layers together. Most paintings aren't created with the intention to have them organized for animating. I have to make a lot of edits to make the pieces work in an animation and that usually changes the look of the piece somewhat. Converting the final product to a gif like above also changes the tone of the image.With this piece, there were many many different layers of lighting that were drawn with different transparencies and filter masks. I could edit the character underneath, but when they'd move the lighting wouldn't. You can imagine that gets messy really quickly. I did a combination of merging and creating my own lighting from scratch. This other piece is an example of something specifically organized to be animated while it was being painted and you can see it bears a much closer resemblance to the original.