There are a lot of tell-tale signs that indicate whether a girl is interested in you are not.
Sometimes it’s very obvious, but most of the time it’s very subtle due to certain social circumstances and cultural programming.
One thing is for sure, it exists. And the moment you notice the signs that says she’s interested in you, you have to take action and don’t let it pass like most guys do in those situations if you want to meet and get to know her. That’s may only be your window of opportunity.
Don’t waste it.
It’s good that you noticed them in the first place, and that puts you already way above the crowd. Well, the choice is still yours whether you want to approach her or not.
What are these signs?
It’s a given if she’s looking in your direction and smiling. You can clearly tell it’s an invitation to approach her and start a conversation. That signal is strong enough for most guys to start an interaction.
You just have to be observant of your surroundings and always on the lookout for quick glances and the occasional “look”. Of course, you can initiate this yourself, and see how she’ll react. You’ll usually know if she’s interested in meeting you in those few precious seconds.
Most of these “come hither” signals almost always involve the eyes combined with something to catch your attention like fixing her hair, putting makeup, and/or fixing her posture.
These are often very subtle and she’ll do this if she knows you’re looking and if she’s interested in you. These are what most guys often miss because they’re really small movements and most men don’t know they’re signs of interests.
A lot of these signs of interests are detailed in Undercover Sex Signals. You’ll be able to get a more detail explanation from there and I suggest you take a look at it and some other body language books and materials to give you a clearer picture of what to look for.