Really love looking over these model sheets. Not just to look at the draftsmanship from these old school disney animators, but to look at their notes! It's really crazy because it's like they really want to help you draw the character right and they think about pitfalls someone drawing the character might run into and will point out certain features of the character that really make that character iconic.
So if it's like fingers, they'll be all like "yeah, we usually draw finger like this, but for this character add a little more mass in the middle" or "we usually put the eyes halfway, but let's lower that to 2/3 for this character" or "screw perspective, try to always show this part of the character's head [happy face]". Really fun stuff.