I am answering this at school with someone else so...
We think that it is easier to link the narrative poems.
Ode to psyche and Greician Urn are routed in mythology which is a typical trait of romantics. While Nightingale and Melencholy are more individual because they show Keatsean pain etc.
The final Ode To autum is the epitiny of his work and is back to romanticness.
Anyway here is my input you'd need to know some kind of timeline for this question,
(IS it an essay Q?)
But you could also do it by use of examples of style and language technicques like synastia and epithets. Also how he combines and creates words and images very simply as compared to theearlier work and examples of hyperion.

My imagination is a monastery, and I am its monk. You must explain my metaphors to yourself.