Well, it's important to have a proper frame and confidence when you do it otherwise it's too easy to come across as a creep. You have to be confident, not afraid to hold eye contact and have your eye contact down to be more serious. It's difficult to explain... It's like a cross between "dagger eyes", having a stare that could "cut through ice" and being non-threatening but also sexually inviting. Maybe i'm putting too much importance on how you give eye contact... the simplest explanation would be to be "serious." I have a non-threatening face so it works well for me.
I haven't read this but just did a quick search on it. First few sentences seem on track with what i'm saying:
https://womenattracted.com/how-to-use-s ... s-aroused/
Anyway, just hold eye contact and be slow in how you do it. You check her out and let her know you're checking her out if she looks in your direction by holding eye contact. This catches her attention and peeks her interest. She knows you're into her. Immediately she'll start waiting for you to approach her or she'll see it as a sure thing and come to you if only to find out why you're looking at her. When she breaks eye contact keep your gaze there(She'll notice) then slowly pay attention elsewhere. Don't be afraid to look back towards her if she's facing your direction but don't go overboard at the same time. Remember, you're a confident guy with a lot more going on in your head than one SHB and you're conveying this to her. In doing this and keeping this mental frame you're also showing her you're high value, someone a lot of women are after which will drive her nuts.
Normally what I do is lower my head a small bit to emphasise my upper features(Nose, eyes, hair but specifically eyes) and slightly narrow my brows so as to give a more serious look. (( Looking at this image you can see how a narrow, lower and more serious eye/brow looks sexier than a higher, arched and relaxed brow:
http://www.spmbylilly.co.uk/eyebrow-shapes.jpg The same feature attracts men as it does women thus women plucking their eyebrows to make them thinner and more straight and narrow)) I don't smile, I keep my jaw straight(Slight gap between my teeth without opening my mouth) and hold a neutral stance on my lips. A perfect way to see the difference in how you look and do the jaw thing right is go to a mirror, relax your jaw and lips then loosely bare your teeth with your lips left loose and closed. Your bottom two teeth should be touching your top two teeth tip to tip. For me I usually have to extend my jaw because I don't have an under bite. That's how you get the look of it which is sexy, generating attraction. The rest is down to your frame, not shying away from eye contact, letting her break contact and then paying little attention towards her but letting her know you're interested by checking her out every now and then(Holding eye contact). If you get this you generate interest and more attraction. You're confident, important and not afraid: You're alpha. This works in clubs for night game. I don't do it in social game unless they're across the room and they've checked me out or shown some interest in me before.
I've had women rush to dance on front of me when they see this, come up to me and try get me to dance with them. I've had extremes of women just coming up to say "Hi" to them coming up to me and inviting me to have a drink with them. Generally the only ones who will invite you for drinks are some of the hottest in the club and have a lot of confidence.
Also, forget that bullshit some people or websites will say about "waiting" for a chick to check you out first. I, personally, think it's bullshit so newbies don't go around beaming the shit out of every chick they think is hot, freaking them out. My understanding is if you're confident, abundant in women and a chooser(Good quality) you won't give a damn if she's checked you out first; you won't need that confirmation because when you see something and want it you're not afraid to get it. It's probably the most confident way to think.
I guess my game would be more passive in generating initial attraction and this works well for me because I don't go all in at first but raise attraction and interest from a distance making the woman want to find out about me. Consider it the "Mysterious" stranger persona if you want to put it in context. The mysterious guy doesn't go up to every girl he sees, gropes at her and tries to make her laugh, he's more serious and calculated; he's more of a wild card.
After she approaches I go direct and run normal game. Doing this generally peeks her interest really god damn high so she goes in wanting you making it hard to fuck up or turn her off unless you turn out to be boring, shy and a loser.
Another thing that's related... When you're talking to a girl you like talk over her shoulder and if there's another woman behind her do the eye thing. The chick will sense this, catch your look from the side and find it attractive. She won't look behind her to see if you're checking out another woman but she'll be thinking someone else is distracting you or you're interested in something else. It not only forces her to raise interest in you but it gives you a distraction away from her making you less nervous and focused on this one woman which, in turn, has your target(The woman you're talking to) focus more on you and generating attraction between you and her. You can also do this if you're just talking to a friend and want to flirt with the woman behind your friend. It's confident and an excuse to be looking in that direction.