im with lpp on the femininity thing, and i agree its very confusing to put to words exactly.
i guess the best description is what lpp wrote fiorst: being womanish. (without overanalyzing the whole matter)
as gwen said in another thread, its a fine line between "uuh, manly" and "uuurgh, get the hell under the shower! NOW!" - although it may be the same basic traits that make these two - its just the balance. its similar with putting attention to oneself and overgrooming - im sure that one can find a pair of guys out there that do have roughly the same amount of time spent on their appearance, with one being perceived as yummy masculine and the other as weird/girlish/overdone.
i think the main thing is "to make it work" . as its not a checklist kind of thing: this, this and this = femininity.
there are tomboyish girls that are incredibly feminine, because "they make it work", whereas there are others that appear very similar to the cute tomboy girls but dont seem to be feminine. maybe its similar to the clothes thing: some people can make certain clothes work, while some others simply cant manage to. by this, i dont mean that some girls wont ever be feminine, but they wont be feminine in a certain way. a trait that sinbglehandedly defines the femininity of woman a would destroy it all for woman b. its a similarly vague thing as beauty (id even dare to say what we mean by femininity is "a feminine way of beauty") - while on some girls, i might be put off immediately by the fact that she has a few pounds too many for my taste, some others absolutely make it work, and they are no less beautiful than my "ideal girls".
from how you appear via this forum, id say that both gwen and missconstrue appear very feminine to me, although especially gwen seems to be so much on the geekish/dorkish side of things, where you usually find boys only.
there may be girls who are far from "hello! im female! look at the cleavage on display, the barely behind-covering miniskirt and the high heels!" but very feminine in their own right. on the other hand, there may be girls that can easily be judged as "biologically female" from their whole demeanor, but who arent feminine at all. to me, britney spears is a prime example - although she had a beautiful figure in her earlier career days, she didnt come across as feminine to me. natalie portman, on the other hand, can walk around in a thick pullover and baggy trousers, but the way she moves, behaves, talks, smiles, etcetera, makes her very feminine.
my advice for you girls is not to overthink this whole thing... i guess it falls into place rather naturally.