Try to avoid the mistake of putting superficial qualities such as stating that the guy must have good dress sense, be rich, chivalrous and so forth.
It should not be a picture of you 15 years ago or when you were 20 pounds lighter than you really are now.
If you want to find the right guy and make online dating easier for you, make sure you avoid making them! A man is going to contact you if he finds you physically attractive.
If you have a main profile picture with you and a friend who is more attractive than you, then he is not going to know which one of the girls you are.
A lot of women seem to like using this space just to vent about the opposite sex.
While throwing yourself an online pity-party can be therapeutic, you might want to save it for a personal blog.