"The nymph repeats my final parting cry-"
No. We know who the nymph is and the statement that comes after.
"But Narcissus flung the beautiful nymph away from him in scorn"
Love & Rejection
Setting- "Lovely mountains of Greece" where this group lived
the Oreades
Sentence (someone) to a particular punishment
Condemn: "Condemned me to reflect on my mistake "
She liked to talk a little too much
Echo
"What began as punishment became a blessing"
Yes! It can be interpreted as more than one punishment or more than one blessing from him POV.
"The flowers grew and spread, waving in the gentle breeze which whispered among them like Echo herself come to kiss the blossoms of the first narcissus flowers."
Nature & Myth
"That dumb nymph Echo shook with hope and fear"
Scornful
Lack of stability or unbalanced
Disequilibrium: "I see how in disequilibrium Chaotic order hovers in suspense"
Jealous, jealous, jealous
Hera
"By string at this mirror, eye to eye With mortal beauty"
Yes! Mortal beauty can be interpreted as more than one thing.
"Now she wished indeed that she could speak to him words of love. But the curse which Hera had placed upon her tied her tongue...But her voice lived on, lingering among the rocks and answering faintly whenever Narcissus or another called."
Punishment & Transformation
plain of Thebes
The action or art of imitating someone or something, typically in order to entertain or ridicule.
Mimicry: "As if the mimicry of senseless stone"
A true lover
Aphrodite
"A budding youth, A poet's branching tale"
Yes. We can interpret this as him knowing his ending OR this poem grew from is dying POV.
"Woe is me, for I loved in vain!"
Identity & Reflection
Tone: "Drawing out his arms, he gazed intently down, and as the water grew still again, saw once more the face of his beloved."
Somber, but peaceful
An angelic being
Seraphim: "Imagoes, ranged like seraphim, become A coronal,"
Cursed Narcissus in "Narcissus Reflects"
Nemesis OR Aphrodite
"I'd rather die"
Technically, yes. We have to assume who it is he was originally talking to and interpret why he would have said that.
"The moment he saw he loved—and love was a madness upon him so that he could think of nothing else."
Self-love vs Self-obsession
Tone: "Pattern reflecting pattern, until space Contracts and in a blue bewilderment Of pond and sky"
Melancholy
The heavens or the sky, especially when regarded as a tangible thing
Firmament: "In foam-fringed depth and starry firmament"