These are really beautiful! I love that people share their sketches, single frame or otherwise. They often have even more personality and charm than a finished product, and are often ideas that would never have seen the light of day if they had to even wait for a short to be born into.
I hope we’re seeing the beginnings of a hand-drawn renaissance and the end of the fetish of 3D animation. It has it’s place, but is the sibling of hand-drawn, not the successor. I wish a studio would have the balls to make a feature-length hand-drawn superhero movie before all the good will for superhero adaptations runs out. Avengers movies are basically 3D animated features at this point. How cool would it be if comic book movies actually looked like comics. With the budgets these films attract, you could employ some top-flight talent.