Something chosen if you want to start up a conversation. If it’s a date then calling someone pretty is fine. But for a stranger it’s best to give compliments based on things you’ve chosen. I made a bunch of friends by just saying how much I loved someone’s shirt in the college cafeteria.
Trust me I get it. I see a pretty girl and it feels like my brain melts. It’s best to just treat women like people. We’ve had enough people being creeps toward us. A genuine compliment about something within our control is something we think about way more than “oh you are pretty”.