Anybody know offhand where in the house you can typically find a stone mirror?
Because I keep forgetting where to find one, and it would really come in handy for me the next time I decide I want to tackle the final fight with the Tattooed Woman again.
Thanks in advance!

Hmmm... I never happen to run out of Stone Mirrors; I'd like to help, but I only know the loctions of a few of them:

--Manor of Sleep: Well Room (Dianthus key needed)
--Manor of Sleep: Room with Blind (upstairs)
--Manor of Sleep: Shrine Courtyard
--Manor of Sleep: Secret Passage (only available after obtaining the Notched Arrow Key; which at the same time is only available after beating a Special Ghost (Stroller Grandma) on hour IX at the Foyer of the Manor of Sleep, which at the same time only appears if you take a picture and develop the musty film it gives on Hour VI, on the partitioned room). Take cautions, if you die, even if you have a Stone Mirror, the special ghost will be gone for ever.

--Manor of Sleep: Engraving Shrine (Not sure about this one)

Hope it helped, you'll see that the fight is not that hard if you have a Stone Mirror, If you have troubles on finding them just leave Miku without one, she's the first one to be "taken to the other side" and most of her fights are really easy if you use the Sacred Stone and Double abilities. You know, literally you can take out a Rope Priestess with the stone and a double charge in three shots, I found this whilst having to deal with her at 10% of my health; just Double Fatal Frame most of the ghosts and the rest comes by addition. That's why it's not surprise that Miku was left without Upgraded lenses; she would be overpowered!