Advice from the old lady:
You will never know the answer to this impossible equation. Social interactions are not algebra. Not formulaic. If you think she's cute? Say hello. No matter what.
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Just take your shot & see what happens. Fear will ruin you in the human interaction game. She's not going to bite you. Go say Hi.
It really is as simple as this;
It helps if you're naturally talkative/sociable - and it helps A LOT if you're comfortable in your own skin.
I'll speak to absolutely anyone, man or woman, and whether I find her attractive or not - So when I do find a woman attractive, it's easy to start a conversation. No formula required, and no need for anything 'startling' - I'll just comment on whatever is around us at the time.
Don't be 'outcome dependant' though - You don't want to come across as 'Try-hard'.
If the conversation flows, great, if not, just move on with your day, no harm done.
A few examples where things have gone well:
• In a music store, saw a woman looking at guitar strings with a note in hand - I commented she looked puzzled..
Turned out she was getting them for her son (hence the note)... I helped her choose, the conversation went well >>> Coffee >>> A few months together.
• During Covid times, in line in a grocery store, I commented it's like the lines at a theme park, but without the ride at the end - She laughed >>> Almost a year together.
• Parking my car in town, noticed a stunning (to me) redhead doing the same, commented on the parking situation at the time >>> We are currently still together...
OP - Get into the habit of speaking to absolutely anyone, get comfortable holding a basic conversation for a few mins...
If it's a woman you find attractive, you'll soon learn to pick up on cues as to whether or not she might be interested - If it seems she might, go for the contact info...
If not just move on and forget it - She will... Don't sweat it, it's really no big deal to talk to someone with no outcome - and sooner or later it will 'stick' with one.