Summarizing

For oft, when on my couch I lie
In vacant or in pensive mood
They flash upon that inward eye
Which is the bliss of solitude
And then my heart with pleasure fills
And dances with the daffodils

In this stanza, the poet says that whenever he feels vacant or pensive, it suddenly comes "flash" to his mind "inward eye" which is a metaphor the dancing daffodils so that his heart fills with pleasure, so that's a metaphor, and dances with the dancing daffodils, so that's a personification because the post gives the the dancing daffodils a human quality of being able to dance.

Sound devices:
Assonance: lie, eye; in, in; with, with; when, on; which, of
Alliteration: They, that

Could you please check my summarizing and sound devices?
Thank you in advance