I really like the line art thus far on this. Looks like you really know the method of sketching. I persionally think if a sketch is not messy then I am doing it wrong. Never spend a while on the initial sketch of a pose or setting. I do a clean up of my sketch with a pencil with darker strokes. Then I ink and erase the messy sketch. Coloring always takes time to creat layers. Painting does too, but mostly because of drying time. Keep up the good work. I hope you finish it. This looks fantastic thus far!