ben torah: you're a guy, cannot understand girls, etc.
to actually answer what you said, i'm considered very very high level bais yaakov, yeshivishe, whatever, and i wear make-up. and yes, i like looking pretty, i feel better that way. when i know i'm coming in contact with boys (not for a date) i tone it down a bit - but i wear make-up.
and my rebbetzin wears make-up.
obviously not all those creams and powders and what have you that oomis was talking about (btw oomis, that sounded to me a bit over the top, could be i'm wrong.), but a woman does not want to look 'schluchy' no matter where and what stage of life she's in.
and i'll agree with you that a woman/girl can look pretty without make-up, but MOST of us, including shpitz bais yaakov girls, are not (yet) and maybe never will be, on that level.