If you need to approach girl in public make sure you don’t forget to do the following steps in order to make a girl interested in you.

1. Make eye contact

If you see a girl you’d like to meet, try to make eye contact before talking to her. Look away for a few minutes then try looking at her again. If she catches you stealing quick glances at her, it will demonstrate to her that she has caught your attention and you are interested in her (she start thinking about) .
If you repeatedly make eye contact with someone, it could be a sign that she wants you to approach her. 3 or 4 glances from a girl might signal that she’s interested.
Eye contact activates our brain’s reward center, making eye contact a powerful tool for attracting someone.

2. Smile!

A friendly smile is a great way to show someone that you’re interested in them. If she returns the smile, that’s a sign that she might be interested in you. Once you’ve exchanged a few glances and a smile, try approaching her to say hi and ask her about her about what she’s doing,example:“Hi, I couldn’t help but notice you over here.What are you studying/reading/up to?”

3. Assess her for positive body language

While reading another person’s body language is not an exact science, there are definitely a few behaviors to look for that will signal that the person is interested in engaging in conversation. If she is facing her body toward you or leaning toward you, that could mean that she would feel comfortable with you approaching her.
If she makes eye contact or smiles at you, it could be a sign that she’s interested in you. approaching her!