Do you honestly think that anyone else would know the difference if they hadn't seen Queen's Blade?
Tagging rules are "Tag what you see, not what you know." The only exceptions are if there is text on the image contradicting it, or when the artist's comments (on pixiv or whatever) do so.
No, because it is easy to remember a character's name you like, and still never look into the actual series. I know that I have looked up Ymir, but only on Danbooru, and never bothered with the actual show. And doesn't everyone know that dwarven women have beards?
You like those eh? Try Aldora's. Her feet are the best.
And only in Tolkien and Pratchett have Dwarven women had beards. I guess most writers can't get around the idea of women having facial air. Not that that's a bad thing, since Ymir is very cute the way she is.