Beautiful simplified anatomy combined with an elegant art deco style. And did they ever work out perspective challenges of those wings. I don't know who drew these construction model sheets, but Eric Larson did a fair amount of gorgeous animation with these flying horses.
By contrast the juveniles in this sequence look a bit too cute and cartoony to me. Their overall animation is fine, but a certain solid body structure is missing.
To me it's the adults that steel the show.