how to gauge a womens interest first time meeting?

im 25 and i say i do pretty well with girls. my friends say my approach is good and they all say certain girls are looking at me. when i approach girls at bars i basically go up to them ask them there name say my name ask them im bout to leave so let me get your snapchat if they dont have that phone number never ig i tell them i dont accept that or maybe something like i like your tattoos and ask for there info looking them in there eyes there always smile or what not. my buddies say im not making long conversation thats why and im not  making a impression on them. what do you think ? im also asking this because im not getting text back 80% of the numbers or snaps im getting.i want everyone response but really wanna hear what the girls have to say. i really think these girls are attracted to me physically but yeah