Answer (not more than 1 sentence is required): The way she carries herself. That’s it.

Explanation: As I could see many answers and notice the following WORDS out there: eyes, haircut, smiles, figure, humour, simplicity... but I would like to emphasis on the fact that “GETTING ATTRACTED” is not an absolute thing, it is relative as it varies from person to person. Everyone trying to get the answer of this question has their own perspective, which is perfectly fine but its a view from their relative positions.

Because if only girl with simplicity or humour were attractive then those with attitude or serious girls were never liked by anyone or were always given second priority after the simple and humorous ones. But there is always a admirer guy for most of the girl , be she very shy, very conservative, be she underweight, be she over-sized, has not so good eyes or not so good smile or not so good humour or be she too chubby , not so good figure, or be very thin or anything. Why? Because how so ever the girl is , her confidence of carrying herself with what she is, will definitely make guys get attracted to her!

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P.S.(Not the part of answer. Just for those girls reading the answers to this question): I just remember a fact that If one is not so rich, he may not wear a new dress everyday but can be attractive even if wears the same dress repeatedly but nicely washed and clean. And one who is rich, can anyways wear a new dress everyday which of-course would be clean and shiny, doesn't matter if he don’t wash his clothes any day- still he would be attractive. Hence what matters is that you know your strength and carry yourself that way. Guys definitely gonna get attracted! :)