I agree that beauty is highly subjective, however there is definitely a pattern/difference with how farang and thai men date women. Farangs usually go for the tanned bar girl type whilst thai men prefer the fair skinned office lady type.
I know that sounds like a gross generalization but that has definitely been my experience whilst living in Thailand - and the longer I live here the more I find the white skinned, long haired nose job beauties more attractive than their brown counterparts.