low version doesn't have a chain.

Medium and high are fixies apparently, (or they have a worm gear, although the hub doesn't look big enough for that), since neither has a derailleur. That would also explain the lack of brakes at least.

Low is still obviously failing the "test". It's pedals are not actually attached to the bike either.

Medium has a handlebar that goes through the pelican's beak. So I'd say also failing.

For the high, the only nitpick would be that the bell isn't quite on the handlebars and the stripes on his scarf don't line up correctly.