Make your intentions clear. You don't have to say something blunt like, "I want you." Casually interject that she is "good-looking," or "stunning," or something along those lines to show you find her attractive. ...
Respect her ideas, her opinions, and her beliefs. Girls like it when you treat them like people. If you want girls to find you attractive, respecting them as people is a great place to start. For example, ask her about her favorite hobby, and then ask her how she got into that hobby.
It can be triggered in a variety of ways: through touch, pheromones, body language, behavior, the tone of your voice, humor, confidence, and vulnerability. (Vulnerability is a really big one.)
Keep your gaze on the horizon while walking. Doing so makes you appear more approachable and sociable.
Don't be afraid to be expressive through your eyes. Widening them in surprise, or narrowing them when you're skeptical, shows that you're engaged and paying attention.
If you want a girl to go crazy for you, then you have to make her feel special by actually taking the time to recognize her as a unique individual. Tell her, “You're not like other girls…” or “You're so different from your friends…” and make her see that she really does stand out to you.
Psychologically speaking, crushes occur when a person of any age projects their ideas and values onto another person whom they believe possesses certain attributes and with whom they want to be associated. Then, the person with the crush attaches strong positive feelings to this magical image that they have created.
She may have good reasons for keeping a lid on her feelings for you. She's already in a relationship and isn't sure whom she wants to be with. She knows what she feels for you but doesn't want you to know just yet. She's ashamed of her feelings for you but can't help showing them sometimes.
Height and weight are right on top of the list of things women notice. “Too much or too little of either immediately classifies the man as unattractive to women, and closes the door before less physically obviously features (such as confidence) can be determined,” says Dr Patzer.