>>279991564
A number of scenes in the first CCS movie used rotoscoping/live actors. They did it the right way and not the shitty Disney/Don Bluth way. But the point is, they probably were using live actors for inspiration. And that's how they noticed little details like arm fat and head turns. I'm always the most impressed by this one scene with Tomoyo in particular.

But I agree. It's actually very impressive how there's little subtle changes to Sakura's design as she ages in season 2 and 3.