Hello Karen & Alex -
Well, the High Priestess is simply stunning; I was bowled over like I've never experienced before. The Queen of Swords (yep, it is she) is lovely too (as jackdaw said, she's ageless). I've loved -- no, been enchanted by -- all your other decks (save one), and own them all. This deck, I know, is going to be my ne plus ultra deck. I love the fact that the cards are borderless (yay!), even more I'm taken by a silver limited, which I'll have, thank you very much. As you might guess from my avatar, I'm very attached to my dark side, but haven't ever found the right deck for it yet -- and now I have.
As to the name -- I really do love Dark Sister; it's so evocative. How about using Gothic in a subtitle, e.g. Dark Sister: A Gothic Tarot? That covers all your bases -- non-English speakers as well as those of us who'll never think of her as anything other than Dark Sister.
I'll eagerly await autumn, "on needles and pins-uh".