Deceptively complex - I love it! The afterlife is a lot less black and white in Greek mythology than most other belief systems - this journey could mean so many things.
It works on the personal/metaphorical level as an exploration your own 'emotional knowledge', rather than truth in reality, as you allude to in your notes. Then it also works on the universal/literal level, the narrator (Charron himself, perhaps?) in fact committing the concept of love to the underworld.
Dark and moody, as these myths so often are, but with real feeling pushing through. It seems pessimistic at first but as I picked up on the references it quickly became more protective, a shepherding of sorts. The underworld is a lot more real and accessible than other cultural afterlives, which provides at least a small ray of hope...
As soon as you've mentioned black and white, I figured out why the piece sends me to Jim Jarmush's "Dead Man" - the pace and the colours!!!! Especially the scene of "going down the river" are felt in the lines:
In general the poem seems somewhat gothic to me... with the classic attributes of middle ages such as dragons and castles.
I like the image of Lady in White - light, purity, goddess, appearing in the dark and silence, but "she will be safe there" - that's what the narrator is desperately trying to convince themselves of, safety for both of them, we read those words THREE!!! times. Safety, but what was the danger they're trying to get out of? And the repetition helps us here:
I love the repetition of the piece! It serves for many things here: uncertanity, pain, and the main one - the connection between the narrator and their beloved!!!! They're two parts of a whole, connected!