Tone is the author's attitude towards the writing, since the author can't use sound in their words he uses diction, which is the selection of words that help create a clear message for the reader.
The lines that contain diction are:
It was a lovely sight to see.
- The writer lets the reader know he was pleased with the sight with the choice of words lovely sight.
Amid the jagged shadows
- The words jagged shadows help the writer to create a dark environment.
To make her gentle vows
- The writer uses the word gentle to speak about a person that is kind.
Her face, oh call it fair not pale
- Call it fair not pale, with this choice of words you can tell the writer has emotions towards her.