There’s nothing wrong with a physical preference, I believe.
It might, however, become unreasonable at some point, such as dismissing very good and compatible people because of an isolated physical trait of minor importance. Or heeding general public opinions instead of one’s own and dismissing a person to whom we are attacted, but to whom the general public wouldn’t be.
I must say I care for looks, but I don’t have a single type. Most of my exes and could-have-beens have had dark brown hair, often curly, shoulder length, and certain similarities in silhouette, maybe a couple of non-physical traits relating to disposition. This does not mean I haven’t been attracted to other types - in fact, I very much have, but my exes and could-have-beens certainly have much more in common than the larger group of women I’ve ever been attracted to. Whether I like the looks (or like them “that way”, which isn’t always the same) generally differs from person to person and I can’t always tell at first glance. You could probably explain it in some Freudian ways, but I think my preferences reflect the course of my life, including what I’ve read, watched, where I’ve been, what’s dear to me.
It’s hard to say how important physical traits are to me since if something turns me off, it’s rarely just about a physical trait. There’s always the matter of choosing a style I don’t agree with, having a taste different from my own, showing a certain pattern of behaviour I can’t get along with.
Oh, and a recent finding I’ve made is that girls who go to church are generally prettier than those who don’t.