I´ve never had a girlfriend, I´m 22 years old, and I´ve never had a girlfriend, never even been close! [no no no]
But I have been attracted to quite a few girls, so I do have some aspects I look for in a girl.

Appearence, well, that´s a hard one. All men wants to be loved by a beautiful woman, there´s no denying that, but it´s not important, at least not compared to other things.
But what do I look for in a girls appearence you ask? Well, I like long hair, shoulder long, back long, though not waist long in most cases, that´s usually too long. Eyes are great, some people have boring eyes, some people have real fishlike eyes (it´s true, I know a girl who has real fish like eyes, scary) Then there are those girls with just truly magnificent eyes, gotta love em! Hair and eye color is irrelevant, though I like blond and black hair. Their size is not really that important, though I have to pass when she´s really obesely fat, like real sumo size. Luckily (for them aswell) few such women exist. It´s not a demand, though I would be lying if I claimed that I didn´t care if they were bigger than me! T&A, never really been a T guy, as I said earlier I´m more of a hair and eyes guy, though I really enjoy a good behind, and sure nice breasts are never a bad thing.
Face is important, I´d like her to have a nice looking face, with a smile. There are some women out there who may be attractive physically, but they just have a constant horrible expression, like a Holier-than-thou look, they gotta go!
Smoking is a major turn-off with me, don´t like it, can´t have it! But I can live with it, though not if I can avoid it!

Mentality. This one is actually the easiest. If they ain´t got brains they ain´t got appeal! Seriously, a woman who may look like a goddess, but is as stupid as a horses arse is just not attractive! Maybe for a one-night stand, but certainly not for a relationship, or even friendship (I know, that sounds really discriminating, but still.....)
I like when women are intelligent, and witty, plus a little self-irony is always good. Sarcasm can be fun, but not too much. She doesn´t have to be Mensa material, but intelligence and humour are absolutely required!

Beliefs. I really don´t care if she´s religious, as long as she doesn´t let that religion dictate how she should live her life! Religion is cool enough, as long as it doesn´t get out of hand.
She gotta be able to hold on to her beliefs, she gotta have them for her own reasons, and not because she´s been "indoctrinated" (A harsh word, I know, if you got a better one, please let me know) If she tries to force her religion on me, well, can´t have that.
She doesn´t have to be interested in politics, but if she is, that´s also good, but as with religion, she has to believe that way for her own reasons.
And finally, I simply can´t have rascism, nothing turns me off like rascism! Such people are lost to me!