A few years ago I made a small (A6) pen & ink sketch of a Demon floating with some butterflies. I made a compositional error and run out of paper at the top so I was never happy with the sketch.
For my previous color digital 2D art, I would color drawings in photoshop. I decided to start digitally painting 'properly' and not leave the drawing as part of the finished art. So I took the opportunity to revive this idea and correct the composition.