Excellent piece! I'm sure I will find occasion to forward this to poets and writers alike.

It's ironic though that the final lines from Keats do the exact opposite of all the advice you've given — they tell without showing. You could insert within them any of those loathsome aphorisms:

'Positive thoughts bring you positive results. Positive results, positive thoughts.' – that is all
Ye know on earth, and all ye need to know.

But I know you're already aware of this irony, so I eagerly await your next piece on subverting the don't tell rule through hypodiegetic devices.

Looking forward to more in the series!