The hub really made folds bigger, and I want to say deeper but I don't know if thats the right word for it. I learned that at the high points are really light with now shading, the medians are a medium shade and the low parts are quite dark. The shading was really the hard part of making the picture 3D. And finally, I didn't like using the charcoal much. I couldn't figure out how to use it well.