やみにさく
ゆふがほのきみよ
そのしろさ
This is the same poem that is written vertically on the scroll.
The mirror on the scroll makes me think there might be a double-meaning in the word やみにさく.
It literally means "blossoming in the dark", but it is also a euphemism for a prostitute (やみにさくはな, "night blossom").
But I'm not entirely sure of that interpretation. The red seals are the seals of the calligrapher's name. I can't read much of them, but since the handwritten note says Hyakujū, I'm guessing that Hyakujū is the name of the artist.