well...
-first thing i look at is her face, if i like what i see then i move on, i normally like dark hair on the longer side, about shoulder length but thats all relative as hair can change, eyes, i'm a sucker for brown and grey. everything else is not a set standard just as long as i like her face i move on.
everything below her face including chest and waist just need to be proportional and not on the heavy side by too much. i love a girl that on the modest side in terms of chest size.
personality is the important part though, the only women i've ever been attracted too are the ones that i can get along with without a care in the world. i mean a girl i can talk and joke with with out any moments or uncomfortable self-consciousness. you would be surprised how rare that is for me.
she has to be funny smart and accepting. i have met a lot of girl who thought me weird as hell when i bring up gaming, manga, books, and a few internet meme's, if she accepts that or if i can get her into to these and most of the above criteria are met then i'm gonna go absolutely nuts about that girl, (should i be single at the time)