As stated earlier, there's a few things you need to keep in mind, and they're all interrelated:
- your vibe is important. Consider this sentence: "hey, I like you, I'd love to take you for coffee sometime". Imagine saying this with unsure pauses in between, in a fast way (as if you're shy to say it and just want to get over with it), in a high, anxious tone... And in it a "sorry" Or a "please" somewhere, and, well, you can imagine how you'd look like. Whereas imagine saying the same with, in a slow, calm, tone (one that implies "I've been here times before, your reaction doesn't really change much to me), deliver the whole thing with eye contact, maybe touch her on the arm somewhere in the middle of your delivery, and at the end, give her a half smile and a wink... You have a different vibe entirely.
-also related, but this is what's meant by non verbals. I haven't read many articles on this, but one I have read is something along the lines of "how to check girls out properly". It has an eye contact trick which you can use to show interest in a sexy way (dropping eye contact for a second, smiling, getting eye contact again). Winking is a good one. And of course, the fundamentals are part of this- good posture and sexy walk make YOU feel good, so you're already in a good vibe... That's before she takes note of your posture. Why is all this done. Brings us to the last point.
- it's about HOW you communicate your interest. Why worry about how the sentence in the first point is delivered? Why bother to incorporate those little changes in non verbals in your life? It's because they show attraction... In a way 90% of guys don't: they say I WANT you, while implying I don't really NEED you. And that's the whole point: you need to convey your interest openly, while maintains that your interest isn't going to last long if not taken into consideration. You're telling the girl that yes, I do want you, I do want to take you to bed, but if you ask for too much, if you give me a hard time, I'm not really willing to put up with it.. So I won't chase you and beg for you to go out with me (which is what 90% of guys in her life do). And that's the essence of how to show attraction.
Of course, it's easier said than done. I gave you a few examples of what to do and what not to, but sometimes I get short of ideas with some girls. But you know what? It's fine. Because you can't really get this without practice. You need to experience it first hand, and think to yourself "ah, I said this, did that with this girl, and I came off as needy. I need to fix that for next time. Before long, you'll notice that you truly are internalizing the concept of showing attraction efficiently, while portraying your value and unwillingness to chase