Even just as basic sketches your drawings have such a refined look to them. Lots of people (myself included) couldn't get these kinds of relatively smooth curves and lines in one stroke, especially on a sketch, and especially-especially using what I'm guessing is just a normal pen on a rough, uneven paper towel. Getting to see your physical drawings is really interesting, too - they have a different kind of expressiveness than your digitally-made works. I think it's partly because of the shading, and because you use lines for shapes here when your digital pictures largely use solids for shapes. It's a really cool comparison.