“the wind at the last watch blows my dream away, leaving no trace.” That’s evocative

“painted loft” ?

“to tap the incense clean” ?

“Incense was commonly formed into ancient seal-script characters, and the fire that consumed it followed the joined strokes until only ash was left.” This is interesting, but I’d need I think to SEE what they mean

“I look back toward the purple-gold peaks,
as rains soak everything and the mist thickens.” Nice description

The final three lines lose me a bit, seeming less connected to the previously sound core of the poem